Grinding Wheel Mounting Flange Set Tool Mounting Connector Size 5/8 In.-11 Tool Mounting Connector Type Threaded Hole Product Type Grinding Wheel Mounting Flange Set Outside Flange Diameter 4 1/2 in Compatible Wheel Diameter (Maximum) 5 in Compatible Wheel Diameter (Minimum) 4 1/2 in Maximum Operating Speed 13 300 RPM