Rex-Cut Abrasives’ Sigma Z grinding wheel blends rapid stock removal and operator control and is engineered for improved productivity. The high-performance wheel is for stainless steel, carbon steel, mild steel, galvanized steel and alloys. It boasts the highest metal removal rate out of the Sigma wheels. It also features cool grinding, extended wheel life and a chatter-free operation. The wheel is available in 4.5 in., 5 in., 6 in. and 7 in. diameters.