Use the Groove Edge grinder head to create a groove around the outside of fused glass pieces, beads, stones, cabochons and more. Diamond Groove Jewelry Grinder Bit is used for shaping and grinding the edges of glass pieces and creating grooves in stained glass for wire wrapping. If you're a glass artist, these grinder bits are essential. We have a large variety of different grits available in sizes. All grinder bits are 1.4mm in thickness and come with a set-screw Allen wrench and square-shaped sponge to keep your glass piece cool while you work.Made with a patented diamond bonding process for extra long life. Creates a groove to fit 16 and 18 gauge wire. Assists in securely wire wrapping 3-D glass sculptures and glass jewelry. Eliminates the need to glue jewelry findings. 220 grit. Fits Glastar G3, G4, G7, G12, G14 and all Inland Grinders. Close-up of this item below. Step-by-Step: Wire Wrapping Using a Jewelry Bit See images below 1. Grind a groove around edges of glass cabochon with a jewelry bit. 2. Wrap wire around cabochon firmly from bottom, ending at top. Grip wire with pliers and twist to secure. 3. Bring wires up and wrap around a dowel 1/4" away from cabochon. 4. Using wire nippers, trim ends around base to secure and tuck in ends.