The Original Pocket Crimper™ pliers for beads, from 2 to 3mm, works with either tube crimps or round crimps. We recommend that you use round, spherical crimps if the crimp is going to be hidden as they hold better than tube crimps. Tube crimps, however, are more attractive when they are to be seen. These crimpers have blue PVC handles for comfort and leverage. The jaws are made of high grade steel with non-glare black oxide finish, and precision ground to assure perfect crimps. 3-1/2" long.