Wubbers Medium Square Mandrel Pliers. These Medium Square Mandrel Pliers are good for a number of uses including making even coils, square jump rings, tubes, square beads, and much more! The large, padded handles are extra comfortable and measure 6.75 inches long. The square jaws are a continuous square mandrel as opposed to being tapered. In addition, the jaws are two different sizes, this adds to the versatility of these special Wubbers pliers. The larger jaw measures 8mm and the smaller 6mm square. The length of each jaw is 34mm.