Eurotool Pro-Electric Bead Reamer. Compact, lightweight design makes smoothing and enlarging bead holes quick and easy to do. Includes 3 diamond-coated tips: small reamer, large reamer and 45 degree edge reamer. Use the small and larger pointed reamers for enlarging holes and use the cone-shaped 45 degree edger to smooth the edges of holes. Variable speed control: 1,000 - 20,000rpm. 24V DC.