Pferd Universal Line PS-FORTE Bench and Pedestal Grinding Wheel, Flat, Series: Universal Line PS-FORTE, 12 in Wheel dia, 2 in Wheel Thickness, 1-1/2 in Center Hole, 46 Grit, Medium Grade, Aluminum Oxide Abrasive, 2070 rpm Maximum, Vitrified Bond, Applicable Materials: Steel and All Ferrous Metals, Wheel Type Number: Type 1 Pferd Universal Line PS-Forte 61780 Universal Line PS-Forte Flat Bench and Pedestal Grinding Wheel, 12 in dia x 2 in Thick, 1-1/2 in Center Hole, 46 Grit