Timing Belt Pulleys Bore Diameter 1/4 in For Belt Series MXL For Belt Width 1/4 in For Use With 1/4 in Wide Belts Material Aluminum Maximum Bore Diameter Not Applicable Number of Teeth 36 Outside Diameter 1.105 in Pitch 0.08 in Pitch Diameter 0.917 in Bore Type Fixed Face Width 0.391 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Anodized For Belt Trade Size MXL Hub Diameter 43/64 in Hub Projection 19/64 in