Saitech Attacker, made with 3M cubitron, is the United Abrasives grinding wheel, providing extremely fast stock removal on hard metals with minimal pressure. Applications: Stainless Steel, High Tensile Alloys, Ferrous Metals such as Iron, Steel and Welds. 4 1/2" diameter, 1/4" thick, Type 27 (depressed center), 5/8 bore with hub. For right angle grinders.