Flaring Cup Grinding Wheel Abrasive Material Silicon Carbide/Aluminum Oxide Back Thickness 3/4 in Connector Size 5/8 In.-11 Connector Type Threaded Hole Grit 16 Overall Diameter 5 in Overall Thickness 2 in Rim Thickness 1 1/4 in Primary Material Applicationn Cast Iron Compatible Tool Type Cup Grinder Specification 57AC16-QB Wheel Hardness Q Wheel Type Type 11 Maximum Operating Speed 7 260 RPM Series 57AC Bond Type Resin Face Profile Not Applicable