CGW Toolroom Wheel, Plate Mount, 6 in Wheel Dia, 1 in Wheel Thickness, 4 in Center Hole, 100, Grade: Fine, Silicon Carbide Abrasive, Wheel Type Number: Type 50, 3450 rpm Maximum, I Wheel Hardness, Vitrified Bond, Applicable Materials: Non-Ferrous Metal, Green Wheel, Cup Wheel Shape.