Straight Grinding Wheel Type 1 Wheel Type Toolroom Diameter 14 In. Thickness 1-1/2 In. Arbor Size 5 In. Abrasive Material Aluminum Oxide Bond Type Vitrified 46 Grit Grade Coarse Hardness Medium (K) Max RPM 1800 Purple For Iron High Speed Steel and Tool Steels RC 50 to 68 300 and 400 Series Stainless Steels Soft Steels RC 30 to 45 Series 32A Specification 32A46-KVBE