PGGT Timing Belt Pulley Bore Diameter 3/8 in For Belt Series PowerGrip GT For Belt Width 25 mm For Use With PowerGrip(R) GT2(R) Belts Material Steel Maximum Bore Diameter Not Applicable Number of Teeth 24 Outside Diameter 1.781 in Pitch 5 mm Pitch Diameter 1.504 in Bore Type Plain Face Width 1.281 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size GT Hub Diameter 1 3/16 in