TRAP Timing Belt Pulley Bore Diameter 1 in For Belt Series H For Belt Width 2 in For Use With 2 in Wide Belts Material Ductile Iron Maximum Bore Diameter Not Applicable Number of Teeth 28 Outside Diameter 4.687 in Pitch 0.5 in Pitch Diameter 4.456 in Bore Type Plain Face Width 2.344 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size H Hub Diameter 3 1/2 in Hub Projection 1 1/16 in