PCGT Timing Belt Pulley Bore Diameter 1 in For Belt Series Poly Chain GT Carbon For Belt Width 37 mm For Use With Poly Chain(R) GT(R) Carbon belts Material Ductile Iron Maximum Bore Diameter Not Applicable Number of Teeth 28 Outside Diameter 5.562 in Pitch 14 mm Pitch Diameter 4.912 in Bore Type Plain Face Width 2.063 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size Carbon