PCGT Timing Belt Pulley For Belt Series Poly Chain GT Carbon For Belt Width 36 mm For Bushing Size 2517 For Bushing Type Taper Lock For Use With Poly Chain GT Carbon Belts Material Cast Iron Maximum Bore Diameter 2 1/2 in Minimum Bore Diameter 1/2 in Number of Teeth 60 Outside Diameter 6.375 in Pitch 8 mm Pitch Diameter 6.015 in Face Width 1.859 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide