Cubitron™ II Cut-Off Wheel, Straight, 4 in Wheel Dia, 0.035 in Wheel Thickness, 3/8 in Center Hole, 60 Grit, Medium Grade, Ceramic Abrasive, 19100 rpm Maximum, Resin Bond, Applicable Materials: All Metals, Wheel Type Number: Type 1, Yes Reinforced, OSHA 29 CFR 1910.1200 Specifications Met