Includes 20 assorted shapes covered with diamond particles All bits have 1/8-Inch shanks and come in convenient plastic holder Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing 180 grit Professional Quality, 1/8 in. Shank, 180 Grit. Includes 20 assorted shapes covered with diamond particles. All bits have 1/8 in. shanks and come in convienient plastic holder. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Use on wood, jade, ceramic, glass, hardened steel, semi-precious stones and other hard materials. By Nancie Johnston Very nice drill bit set. Seems to be of good quality. I am using the diamond bits to drill semi-precious gems. One bit has lasted three gems, so far. By 2beekeepers These bits were purchased primarily for drilling sea glass for jewelry making. Since this was my first attempt at such a project, I didn't want to spend a lot of money experimenting. I'm st