Timing Belt Pulleys Bore Diameter 5/16 in For Belt Series XL For Belt Width 3/8 in For Use With XL Belts Material Aluminum Maximum Bore Diameter Not Applicable Number of Teeth 40 Outside Diameter 2.526 in Pitch 0.2 in Pitch Diameter 2.546 in Bore Type Fixed Face Width 0.563 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Anodized For Belt Trade Size XL Hub Diameter 1 1/2 in Hub Projection 7/16 in