Keyless Bushing Flange Type Not Applicable For Bore Diameter 30 mm Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 55 mm Overall Width 34.5 mm System of Measurement Metric Finish Oil Dipped Hub Contact Pressure 25 226.537 psi Maximum Transmitted Torque 31 ft-lb Outside Diameter Tolerance +0/-.002 in