SAIT® Bench Grinding Wheel, General Purpose, 6 in Wheel dia, 1 in Wheel Thickness, 1 in Center Hole, 60 Grit, Coarse Grade, Silicon Carbide Abrasive, 4138 rpm Maximum, Vitrified Bond, Green Wheel, Applicable Materials: Ferrous and Non-Ferrous Metals, Wheel Type Number: Type 1 SAIT® 28103 General Purpose Bench Grinding Wheel, 6 in dia x 1 in Thick, 1 in Center Hole, 60 Grit, Silicon Carbide Abrasive