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 32 Outside Diameter 1 in Pitch 0.08 in Pitch Diameter 0.815 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 19/32 in Hub Projection 19/64 in