Dremel 7123 Diamond Wheel Point 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. Bits are covered with diamond particles. Ideal for fine detail work on wood, jade, ceramic, glass, hardened steel and other hard materials Removes material quickly and easily Covered with diamond particles Use higher speeds for hard woods and slower speeds for metals 1/8" shank User Tips For best results, insert the accessory bit all the way into the tool and then back it out slightly before tightening down. This provides plenty of shank for the collet or chuck to hold onto the bit. Secure objects to a stable surface while working Use higher speeds for hard woods and slower speeds for metals If chattering occurs, increase speed. Specifications: Bit diameter Inch: 3/16" Bit diameter mm: 4.8mm