Straight Cup Grinding Wheel Type 6A2C Diameter 6 In. Thickness 3/4 In. Arbor Size 1-1/4 In. Abrasive Depth 1/16 In. Abrasive Material Free Cutting Diamond 220 Grit 50 Percent Concentration Vitrified Bond Type Max RPM 4140 Specification SD220-P50V99-1/16