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 Steel Maximum Bore Diameter Not Applicable Number of Teeth 17 Outside Diameter 3 in Pitch 0.5 in Pitch Diameter 2.706 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 2 in Hub Projection 11/16 in