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 72 Outside Diameter 1.813 in Pitch 0.08 in Pitch Diameter 1.833 in Bore Type Fixed Face Width 0.375 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Anodized For Belt Trade Size MXL Hub Diameter 1 3/16 in Hub Projection 3/8 in