Keyless Bushing Flange Type Flanged For Bore Diameter 6 mm Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 13/16 in Overall Width 20.5 mm System of Measurement Metric Finish Oil Dipped Hub Contact Pressure 42 143.065 psi Maximum Transmitted Torque 15 ft-lb Outside Diameter Tolerance +0/-.002 in