Walter Surface Technologies Zip™ Cut-Off Wheel, High Performance, Series: Zip™, 4-1/2 in Wheel Dia, 3/64 in Wheel Thickness, 7/8 in Center Hole, A-60-ZIP Grit, Coarse Grade, Aluminum Oxide Abrasive, 13300 rpm Maximum, Resinoid Bond, Applicable Materials: Cast Iron, Stainless Steel, Sheet Metal and Steel, Wheel Type Number: Type 27, For Use With: Angle Grinders