For heavy duty surface cleaning, rust removal, spatter removal and roughening. The Bevel Knot Wire Wheel is more aggressive than the Crimped Bevel Wheel. It is also used when the operator encounters uneven surfaces. Milwaukee offers both carbon and stainless steel wheels in this style of wheel. This Bevel Knot Wire Wheel is designed for use with 4-1/2 or 5 inch Milwaukee and competitive Grinders with 5/8-11 threaded spindles. Made of carbon steel.