Timing Belt Pulleys Bore Diameter 3/4 in For Belt Series H For Belt Width 3 in For Use With 3 in Wide Belts Material Steel Maximum Bore Diameter Not Applicable Number of Teeth 19 Outside Diameter 3.256 in Pitch 0.5 in Pitch Diameter 3.024 in Bore Type Plain Face Width 3.375 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 3/8 in Hub Projection 11/16 in