PCGT Timing Belt Pulley For Belt Series Poly Chain GT Carbon For Belt Width 37 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 35 Outside Diameter 6.816 in Pitch 14 mm Pitch Diameter 6.141 in Face Width 1.69 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide