Keyless Bushing Flange Type Flanged For Bore Diameter 1/4 in Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 13/16 in Overall Width 0.807 in System of Measurement Inch Finish Oil Dipped Hub Contact Pressure 39 820.219 psi Maximum Transmitted Torque 15 ft-lb Outside Diameter Tolerance +0/-.002 in