Straight Grinding Wheel Type 1 Wheel Type Toolroom Diameter 10 In. Thickness 1 In. Arbor Size 3 In. Abrasive Material Aluminum Oxide Bond Type Vitrified 60 Grit Grade Medium Hardness Medium (I) Max RPM 2485 White 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 38A Specification 38A60-IVBE