TRAP Timing Belt Pulley For Belt Series H For Belt Width 1 in For Bushing Size SK For Bushing Type Quick Detachable For Use With 0.5 in Trapezoidal Pitch Material Cast Iron Minimum Bore Diameter 1/2 in Number of Teeth 40 Outside Diameter 6.6 in Pitch 0.5 in Pitch Diameter 6.366 in Face Width 1.312 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide For Belt Trade Size H Material Fabrication Cast