Pferd Universal Line PS-FORTE Bench and Pedestal Grinding Wheel, Flat, Series: Universal Line PS-FORTE, 7 in Wheel dia, 1 in Wheel Thickness, 1 in Center Hole, 46 Grit, Medium Grade, Aluminum Oxide Abrasive, 3600 rpm Maximum, Vitrified Bond, Applicable Materials: Steel and All Ferrous Metals, Wheel Type Number: Type 1 Pferd Universal Line PS-Forte 61755 Universal Line PS-Forte Flat Bench and Pedestal Grinding Wheel, 7 in dia x 1 in Thick, 1 in Center Hole