Dish Grinding Wheel Abrasive Material Aluminum Oxide Back Thickness 5/16 in Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 6 in Overall Thickness 1/2 in Rim Thickness 3/8 in Primary Material Applicationn Aluminum Cast Iron Stainless Steel Tool Steel Compatible Tool Type Tool and Cutter Grinder Specification 32A60-JVBE Wheel Hardness J Wheel Type Type 12 Maximum Operating Speed 4 140 RPM Bond Type Vitrified Color Purple Grade Medium Series 32A