PCGT Timing Belt Pulley For Belt Series Poly Chain GT Carbon For Belt Width 68 mm For Bushing Size 3525 For Bushing Type Taper Lock For Use With Poly Chain GT Carbon Belts Material Cast Iron Maximum Bore Diameter 3 15/16 in Minimum Bore Diameter 1 1/2 in Number of Teeth 63 Outside Diameter 11.75 in Pitch 14 mm Pitch Diameter 11.053 in Face Width 3.328 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide