Straight Grinding Wheel Type 1 Wheel Type Bench/Pedestal Diameter 6 In. Thickness 1/2 In. Arbor Size 1 In. Abrasive Material Aluminum Oxide Bond Type Resin 36/46 Grit Grade Coarse Max RPM 4140 Brown For Carbon Steel Includes 1/2 In. 5/8 In. 3/4 in and 7/8 in Arbor Bushings