Timing Belt Pulleys Bore Diameter 3/16 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 15 Outside Diameter 0.555 in Pitch 0.08 in Pitch Diameter 0.382 in Bore Type Fixed Face Width 0.328 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Anodized For Belt Trade Size MXL Hub Diameter 9/16 in Hub Projection 15/64 in