Spyder Bite ceramic abrasive flap discs provide fast stock removal and a smooth finish on mild steel, stainless steel, ferrous metal and cast iron. A 5/8-11 spin-on arbor is up to 2x faster to install than using a conventional 7/8-in angle grinder nut and makes it easy to remove without requiring separate removal tools. Premium ceramic abrasive flaps remove up to 6x more material than premium bonded abrasive grinding wheels. 36-grit abrasive provides fastest stock removal, 80-grit abrasive provides smoothest finish, 60-grit abrasive provides a blend of fast stock removal and smooth finishing.