CGW® Surface Grinding Wheel, Straight, 7 in Wheel dia, 1/2 in Wheel Thickness, 1-1/4 in Center Hole, 100 Grit, Fine Grade, Aluminum Oxide Abrasive, 3760 rpm Maximum, Wheel Hardness: K, Vitrified Bond, Wheel Type Number: Type 1, Applicable Materials: High Speed Steel, Alloy Steel and Mold Steel, Blue Wheel CGW® 34330 Straight Surface Grinding Wheel, 7 in dia x 1/2 in Thick, 1-1/4 in Center Hole, 100 Grit, Fine Grade, Aluminum Oxide Abrasive