This head combines a flat and radius (rounded) edger. Select this for mosaics or when working with exposed glass edges. Use the fine grit radius head to virtually eliminate chipping on decorative mirror edging. Standard 100 grit. Made with a patented diamond bonding process for extra long life. Fits Glastar G3, G4, G7, G12, G14 and all Inland Grinders. Diamond Grinding Bits for Glass Stained Glass Grinder Bits Glastar Grinder Bits Inland Grinder Bits Glass Grinder Bit for Dremel Twofer Grinder Bits Inland Grinder Parts Grind a single surface or the top and bottom simultaneously Will grinds an even edge on fused or textured Glass Easier to apply foil Creates a wire wrapping surface Leaves a chip-free edge