Most typical of the metal cut off wheel

Most typical electric angle grinders use a 4 1/2-inch diameter abrasive disc. The metal cut off wheel is supported on an axle bolt with a cupped washer underneath fastened in place with a nut. The disc spins on a horizontal plane with the front edge protruding from the front end of the tool. The polishing disc are made with one hand on a handle above and behind the disc. The other hand operates a trigger at the back end of the tool. The discs vary in thickness and abrasiveness depending on the type of cut needed. A metal cutting disk for hardened steel is also available, made from steel with a diamond-coated edge.