PGGT Timing Belt Pulley For Belt Series PowerGrip GT For Belt Width 50 mm For Bushing Size 2517 For Bushing Type Taper Lock For Use With PowerGrip GT2 Pitches PowerGrip GT3 Pitches Material Cast Iron Maximum Bore Diameter 2 1/2 in Minimum Bore Diameter 1/2 in Number of Teeth 80 Outside Diameter 8.386 in Pitch 8 mm Pitch Diameter 8.02 in Face Width 2.38 in Features Built for High-Torque Low-Speed Applications Outperforms Industry Standards Superb Flexibility Finish Black Oxide