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16-Inch Gemstones

The 16-inch strand is the industry standard—and no one stocks more of them than Dakota Stones. Browse more than 200 stone types across every color and pattern, from everyday staples like Amethyst and Jasper to collector favorites such as Red Garnet and rare Turquoise mine-runs. Because the strands measure a full 15 – 16 inches, you get enough beads for matching earring pairs, stretch bracelets, or a necklace focal and still have extras for accents.
Need to drill down fast? Use the filter bar to sort by Stone Type when you know the gem you want, or by Color when you’re building a palette first. Shapes range from classic rounds and rondelles to cubes, heishi, chips, and rare designer cuts—each strand calibrated for even sizing and smooth stringing.
Whether you’re a hobbyist replenishing a bead board or a pro assembling a full production run, this category is the workhorse of our catalog: reliable lengths, vast variety, and new additions arriving every month. Dive in, filter your way to the perfect strand, and keep your design queue flowing with Dakota Stones’ biggest collection.

Products: 2419

Golden Sunstone Natural 10mm Round AA Grade - 15-16 Inch

Original price $89.00 - Original price $89.00
Original price $89.00
$89.00
$89.00 - $89.00
Current price $89.00

Sunstone, a variety of Feldspar, is aptly named for its shades of gold, orange, red and brown, as well as its iridescent sparkle. As the stone catc...

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Original price $89.00 - Original price $89.00
Original price $89.00
$89.00
$89.00 - $89.00
Current price $89.00

Golden Sunstone Natural 12mm Round AA Grade - 15-16 Inch

Original price $105.00 - Original price $105.00
Original price $105.00
$105.00
$105.00 - $105.00
Current price $105.00

Sunstone, a variety of Feldspar, is aptly named for its shades of gold, orange, red and brown, as well as its iridescent sparkle. As the stone catc...

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Original price $105.00 - Original price $105.00
Original price $105.00
$105.00
$105.00 - $105.00
Current price $105.00

Golden Sunstone Natural 4mm Table Cut Cube Bead - 15-16 Inch

Original price $29.00 - Original price $29.00
Original price $29.00
$29.00
$29.00 - $29.00
Current price $29.00

Sunstone, a variety of Feldspar, is aptly named for its shades of gold, orange, red and brown, as well as its iridescent sparkle. As the stone catc...

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Original price $29.00 - Original price $29.00
Original price $29.00
$29.00
$29.00 - $29.00
Current price $29.00

Golden Sunstone Natural 8mm Round AA Grade - 15-16 Inch

Original price $54.00 - Original price $54.00
Original price $54.00
$54.00
$54.00 - $54.00
Current price $54.00

Sunstone, a variety of Feldspar, is aptly named for its shades of gold, orange, red and brown, as well as its iridescent sparkle. As the stone catc...

View full details
Original price $54.00 - Original price $54.00
Original price $54.00
$54.00
$54.00 - $54.00
Current price $54.00

Graywood 10mm Round Bead - 15-16 Inch

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

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Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Gray Wood 4mm Round - 15-16 Inch

Original price $5.00 - Original price $5.00
Original price $5.00
$5.00
$5.00 - $5.00
Current price $5.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

View full details
Original price $5.00 - Original price $5.00
Original price $5.00
$5.00
$5.00 - $5.00
Current price $5.00

Gray Wood 6mm Rondelle - 15-16 Inch

Original price $9.00 - Original price $9.00
Original price $9.00
$9.00
$9.00 - $9.00
Current price $9.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

View full details
Original price $9.00 - Original price $9.00
Original price $9.00
$9.00
$9.00 - $9.00
Current price $9.00

Graywood 6mm Round Bead - 15-16 Inch

Original price $7.00 - Original price $7.00
Original price $7.00
$7.00
$7.00 - $7.00
Current price $7.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

View full details
Original price $7.00 - Original price $7.00
Original price $7.00
$7.00
$7.00 - $7.00
Current price $7.00

Gray Wood 8mm Rondelle - 15-16 Inch

Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

View full details
Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Graywood 8mm Round Bead - 15-16 Inch

Original price $9.00 - Original price $9.00
Original price $9.00
$9.00
$9.00 - $9.00
Current price $9.00

Like all of Dakota Stones items, our wood beads are top quality and sourced from the best ethically produced manufacturers. Natural wood beads have...

View full details
Original price $9.00 - Original price $9.00
Original price $9.00
$9.00
$9.00 - $9.00
Current price $9.00

Green Amethyst 3x5mm Faceted Rondelle 15-16

Original price $68.00 - Original price $68.00
Original price $68.00
$68.00
$68.00 - $68.00
Current price $68.00

Original price $68.00 - Original price $68.00
Original price $68.00
$68.00
$68.00 - $68.00
Current price $68.00

Green and Yellow Banded Tourmaline 4mm Faceted Coin - 15-16 Inch

Original price $43.00 - Original price $43.00
Original price $43.00
$43.00
$43.00 - $43.00
Current price $43.00

Green Tourmaline ranges in color from pale green to dark emerald to shades of olive and moss green. It is an aluminum borosilicate mixed with iron,...

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Original price $43.00 - Original price $43.00
Original price $43.00
$43.00
$43.00 - $43.00
Current price $43.00

Green Apatite 2mm Faceted Coin - 15-16 Inch

Original price $16.00 - Original price $16.00
Original price $16.00
$16.00
$16.00 - $16.00
Current price $16.00

Green Apatite is a transparent to translucent stone that may be green, yellow to green or sea to green in color. Apatite has been labeled the “dece...

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Original price $16.00 - Original price $16.00
Original price $16.00
$16.00
$16.00 - $16.00
Current price $16.00

Green Apatite 4mm Faceted Round Banded - 15-16 Inch

Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Green Apatite is a transparent to translucent stone that may be green, yellow to green or sea to green in color. Apatite has been labeled the “dece...

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Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Green Garnet 4mm Faceted Round Banded - 15-16 Inch

Original price $19.00 - Original price $19.00
Original price $19.00
$19.00
$19.00 - $19.00
Current price $19.00

Green Garnet can be among the most valuable of garnets, which come in a variety of colors. Occurring in sizes ranging from a grain of sand to the s...

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Original price $19.00 - Original price $19.00
Original price $19.00
$19.00
$19.00 - $19.00
Current price $19.00

Green Kyanite 3x4mm Rondelle Faceted AA Grade - 15-16 Inch

Original price $38.00 - Original price $38.00
Original price $38.00
$38.00
$38.00 - $38.00
Current price $38.00

Kyanite often occurs as long, bladed, striated crystals, transparent or translucent with a pearly luster. An aluminum silicate mineral, it may appe...

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Original price $38.00 - Original price $38.00
Original price $38.00
$38.00
$38.00 - $38.00
Current price $38.00

Green Lodalite Quartz 10mm Round - 15-16 Inch

Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

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Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Green Lodalite Quartz 12mm Round - 15-16 Inch

Original price $36.00 - Original price $36.00
Original price $36.00
$36.00
$36.00 - $36.00
Current price $36.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $36.00 - Original price $36.00
Original price $36.00
$36.00
$36.00 - $36.00
Current price $36.00

Green Lodalite Quartz 14-16x28mm Nugget Faceted - 15-16 Inch

Original price $74.00 - Original price $74.00
Original price $74.00
$74.00
$74.00 - $74.00
Current price $74.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $74.00 - Original price $74.00
Original price $74.00
$74.00
$74.00 - $74.00
Current price $74.00

Green Lodalite Quartz 4mm Lantern - 15-16 Inch

Original price $20.00 - Original price $20.00
Original price $20.00
$20.00
$20.00 - $20.00
Current price $20.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $20.00 - Original price $20.00
Original price $20.00
$20.00
$20.00 - $20.00
Current price $20.00

Green Lodalite Quartz 6mm Round - 15-16 Inch

Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Green Lodalite Quartz 6x8mm Tri Cut Faceted Rondelle - 15-16 Inch - CLEARANCE

Original price $35.00 - Original price $35.00
Original price $35.00
$35.00
$35.00 - $35.00
Current price $35.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

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Original price $35.00 - Original price $35.00
Original price $35.00
$35.00
$35.00 - $35.00
Current price $35.00

Green Lodalite Quartz 8mm Round - 15-16 Inch

Original price $24.00 - Original price $24.00
Original price $24.00
$24.00
$24.00 - $24.00
Current price $24.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

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Original price $24.00 - Original price $24.00
Original price $24.00
$24.00
$24.00 - $24.00
Current price $24.00

Green Lodalite Quartz 8x6 Table Cut Corner Drilled Cube - 15-16 Inch - CLEARANCE

Original price $32.00 - Original price $32.00
Original price $32.00
$32.00
$32.00 - $32.00
Current price $32.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $32.00 - Original price $32.00
Original price $32.00
$32.00
$32.00 - $32.00
Current price $32.00

Green Lodalite Quartz 6mm Bicone - 15-16 Inch

Original price $24.00 - Original price $24.00
Original price $24.00
$24.00
$24.00 - $24.00
Current price $24.00

Green Lodolite is Quartz with inclusions of sand. These inclusions range broadly in type and color and produce patterns that can look like gardens....

View full details
Original price $24.00 - Original price $24.00
Original price $24.00
$24.00
$24.00 - $24.00
Current price $24.00

Green Strawberry Quartz 6mm Faceted Drop - 15-16 Inch - CLEARANCE

Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Strawberry Quartz is a translucent, milky to pink silicon dioxide mineral. Its needle to like inclusions of hematite are iridescent red. Quartz has...

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Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

GREEN Terra Agate 12mm Round - 15-16 Inch

Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

With the possible exception of the horizon meeting the bright blue sky on a perfect summer day, or a sandy beach blending into a tropical bay, ther...

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Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Heliodor 10mm Round Green - 15-16 Inch

Original price $41.00 - Original price $41.00
Original price $41.00
$41.00
$41.00 - $41.00
Current price $41.00

Heliodor is a yellow, greenish yellow, or golden-yellow color of the mineral beryl. The yellowish colors of heliodor are usually caused by small am...

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Original price $41.00 - Original price $41.00
Original price $41.00
$41.00
$41.00 - $41.00
Current price $41.00

Heliodor 8mm Round Green - 15-16 Inch

Original price $27.00 - Original price $27.00
Original price $27.00
$27.00
$27.00 - $27.00
Current price $27.00

Heliodor is a yellow, greenish yellow, or golden-yellow color of the mineral beryl. The yellowish colors of heliodor are usually caused by small am...

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Original price $27.00 - Original price $27.00
Original price $27.00
$27.00
$27.00 - $27.00
Current price $27.00

Hematite Pyrite Color Plated 2mm Faceted Round - 15-16 Inch

Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

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Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite Pyrite Color Plated 4mm Faceted Round - 15-16 Inch

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite Copper Plated 2mm Cut Cube 15-16 Inch

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite Copper Plated 2mm Faceted Round - 15-16 Inch

Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite Copper Plated 4mm Faceted Rondelle - 15-16 Inch

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite Dark Gold Plated 2mm Cube 15-16 Inch

Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite Dark Gold Plated 2mm Cut Cube 15-16 Inch

Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite Dark Gold Plated 2mm Faceted Round - 15-16 Inch

Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite Dark Gold Plated 2mm Round - 15-16 Inch

Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $10.00 - Original price $10.00
Original price $10.00
$10.00
$10.00 - $10.00
Current price $10.00

Hematite Dark Gold Plated 4mm "Football" Shape 15-16 Inch

Original price $13.00 - Original price $13.00
Original price $13.00
$13.00
$13.00 - $13.00
Current price $13.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $13.00 - Original price $13.00
Original price $13.00
$13.00
$13.00 - $13.00
Current price $13.00

Hematite Dark Gold Plated 4mm Cube 15-16 Inch

Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite Dark Gold Plated 4mm Faceted Rondelle 15-16 Inch

Original price $15.00 - Original price $15.00
Original price $15.00
$15.00
$15.00 - $15.00
Current price $15.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $15.00 - Original price $15.00
Original price $15.00
$15.00
$15.00 - $15.00
Current price $15.00

Hematite Dark Gold Plated 4mm Faceted Round - 15-16 Inch

Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite Dark Gold Plated 4mm Round 15-16 Inch

Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite Pyrite Color Plated 4mm Faceted Rondelle 15-16 Inch

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Original price $11.00 - Original price $11.00
Original price $11.00
$11.00
$11.00 - $11.00
Current price $11.00

Hematite Silver Plated 4mm Faceted Rondelle - 15-16 inch

Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $18.00 - Original price $18.00
Original price $18.00
$18.00
$18.00 - $18.00
Current price $18.00

Hematite White Silver Plated 2mm Cube 15-16 Inch

Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite White Silver Plated 2mm Cut Cube 15-16 Inch

Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $14.00 - Original price $14.00
Original price $14.00
$14.00
$14.00 - $14.00
Current price $14.00

Hematite White Silver Plated 2mm Faceted Round 15-16 Inch

Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Hematite is an iron oxide and one of the few gemstones with a metallic luster. When tumbled it can have the look of polished steel. Hematite is bla...

View full details
Original price $12.00 - Original price $12.00
Original price $12.00
$12.00
$12.00 - $12.00
Current price $12.00

Frequently asked questions

  • What is a 16-inch strand and why is it the trade standard?
    A 16-inch strand is the working length most US jewelry designers buy for design-grade work — necklaces, multi-strand layouts, and bulk component sourcing. It gives enough beads to lay out a full 18–20 inch necklace with clasp and findings, or to cut down into shorter assemblies without running short. The 16-inch length has been the trade default for decades because it standardizes pricing and bead-count math across stones and cuts. Dakota's 16-inch hub covers the full catalog at this length, across rounds, rondelles, faceted cuts, cubes, coins, and shape work. The bracelet counterpart is the 8-inch strand.
  • How many beads per 16-inch strand at common sizes?
    Approximate bead counts per 16-inch strand assume snug-strung beads with no spacer drift. At 2mm you get roughly 200 beads, at 3mm about 135, at 4mm about 100, at 6mm about 66, at 8mm about 50, at 10mm about 40, and at 12mm about 33. Faceted cuts, rondelles, and irregular shapes (pebble, nugget, coin) vary — count is driven by the bead's drilled axis, not its widest dimension. Exact count should be disclosed; ask before buying if a piece-count is critical for your design and isn't specified.
  • 16-inch vs 8-inch — which length for which project?
    16-inch is the necklace and design-strand length: enough material for an 18–20 inch finished necklace, multi-strand torsades, long earring drops, or component cutting. 8-inch is the bracelet length: pre-cut to the wrist standard, sized for stretch-cord bracelets and single-wrap pieces. Designers running production bracelet lines typically buy 8-inch to skip the cut-down step; designers doing necklace work, statement pieces, or mixed assemblies buy 16-inch for the bead count and pricing efficiency. Both lengths share the same stones and cuts where stocked — the choice is about finished-piece geometry, not material grade.
  • What stones and cuts does Dakota carry in 16-inch?
    The 16-inch hub spans the full catalog. Most-stocked stones include agate, turquoise, quartz, jasper, tourmaline, moonstone, garnet, labradorite, opal, and amazonite, with deeper coverage across feldspar, chalcedony, and silica varieties. Cut coverage runs from smooth round and faceted round (the largest categories) through rondelle, microfaceted round, pebble and nugget, cube, table-cut cube, faceted cube, and coin. Standard sizes are 4mm, 6mm, 8mm, and 10mm, with 2mm and 3mm in microfaceted work and 12mm in larger statement rounds. Filter by stone, cut, or size to narrow the grid.
  • How does Dakota measure 16-inch strand lengths?
    Strand length is measured end-to-end along the drilled axis, beads strung snug with no gaps. A 16-inch strand can run 15.5 to 16.5 inches depending on bead shape and how the cutter finished the temporary string — irregular shapes (nugget, pebble, raw-faceted) sit at the looser end because the drill points don't always center on the bead's midline. Bead count per strand reflects this variance. Length and approximate count should be disclosed; if you need a tight tolerance for a calibrated production run, ask before buying so the team can pull and measure before shipping.