TRAP Timing Belt Pulley Bore Diameter 3/4 in For Belt Series H For Belt Width 1 1/2 in For Use With 1 1/2 in Wide Belts Material Ductile Iron Maximum Bore Diameter Not Applicable Number of Teeth 26 Outside Diameter 4.369 in Pitch 0.5 in Pitch Diameter 4.138 in Bore Type Plain Face Width 1.813 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 3/8 in