TRAP Timing Belt Pulley Bore Diameter 1/2 in For Belt Series L For Belt Width 3/4 in For Use With L Belts Material Steel Maximum Bore Diameter Not Applicable Number of Teeth 13 Outside Diameter 1.781 in Pitch 0.375 in Pitch Diameter 1.552 in Bore Type Fixed Face Width 1 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size L Hub Diameter 1 1/8 in Hub Projection 1/2 in