Pferd universal line PS-Forte bench and pedestal grinding wheel, flat, series: universal line PS-Forte, 6 in wheel dia, 3/4 in wheel thickness, 1 in center hole, 80 grit, medium grade, aluminum oxide abrasive, 4,140 RPM maximum, vitrified bond, applicable materials: steel and all ferrous metals, wheel type number: type 1. Pferd 61742 Universal Line PS-Forte Flat Bench and Pedestal Grinding Wheel, 6 in dia x 3/4 in thick