Milwaukee® Cut-Off/Raised Hub Wheel, Type 1, 4-1/2 in Wheel Dia, 0.045 in Wheel Thickness, 7/8 in Center Hole, A60T Grit, Hard/Medium Grade, Aluminum Oxide Abrasive, 13580 rpm Maximum, Applicable Materials: Metal and Stainless Steel, Wheel Type Number: 1, Wheel Hardness: T