Timing Belt Pulleys Bore Diameter 1/8 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 10 Outside Diameter 0.425 in Pitch 0.08 in Pitch Diameter 0.255 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 27/64 in Hub Projection 15/64 in