Keyless Bushing Flange Type Not Applicable For Bore Diameter 28 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 27 028.432 psi Maximum Transmitted Torque 29 ft-lb Outside Diameter Tolerance +0/-.002 in