Tool and cutter grinding wheels are used for heavy stock removal and for repairing and sharpening tool bits and cutting tools. Bond type can be metal (electroplated or brazed), vitrified, or resin. Tool and cutter wheels are available in several shapes, including flat (Type 1), taper edged (Type 4), cup (Type 6), flared cup (Type 11), and shallow dish (Type 12). Common materials include aluminum oxide, CBN, and diamond. Choose from coarse to ultrafine grade, or corresponding grit, depending on material being worked.