Straight Cup Grinding Wheel Abrasive Material Aluminum Oxide Back Thickness 3/8 in Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 5 in Overall Thickness 1 1/2 in Rim Thickness 3/8 in Compatible Tool Type Tool and Cutter Grinder Primary Material Applicationn Nickel Alloy Steel Tool Steel Specification 38A60-KVBE Wheel Hardness K Wheel Type Type 6 Maximum Operating Speed 4 585 RPM Bond Type Vitrified Face Profile Y Series 38A Package Quantity 5