Recessed Grinding Wheel Abrasive Material Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 7 in Overall Thickness 1 in Wheel Hardness I Specification 32A60-IVBE Wheel Type Type 5 Compatible Tool Type Cylindrical Grinder Surface Grinder Primary Material Applicationn Aluminum Cast Iron Stainless Steel Steel Tool Steel Maximum Operating Speed 3 600 RPM Recess Depth 1/2 in Recess Diameter 2 3/4 in Bond Type Vitrified Color Gray