Recessed Grinding Wheel Abrasive Material Aluminum Oxide Connector Size 5 in Connector Type Unthreaded Hole Grit 46 Overall Diameter 12 in Overall Thickness 2 in Wheel Hardness J Specification 32A46-JVBE Wheel Type Type 7 Compatible Tool Type Cylindrical Grinder Surface Grinder Primary Material Applicationn Aluminum Cast Iron Stainless Steel Steel Tool Steel Maximum Operating Speed 2 070 RPM Recess Depth 1/2 in Recess Diameter 7 1/2 in Bond Type Vitrified Color Purple