PCGT Timing Belt Pulley For Belt Series Poly Chain GT Carbon For Belt Width 37 mm For Bushing Size 3020 For Bushing Type Taper Lock For Use With Poly Chain GT Carbon Belts Material Cast Iron Maximum Bore Diameter 3 in Minimum Bore Diameter 7/8 in Number of Teeth 39 Outside Diameter 7.518 in Pitch 14 mm Pitch Diameter 6.842 in Face Width 1.75 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide