TRAP Timing Belt Pulley Bore Diameter 1 in For Belt Series H For Belt Width 3 in Material Steel Maximum Bore Diameter Not Applicable Number of Teeth 22 Outside Diameter 3.735 in Pitch 0.5 in Pitch Diameter 3.501 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 3/4 in Hub Projection 15/16 in