This is a A-50X60 Sprocket PN: 50X60Main Description As Following : A-50X60 Sprocket P.N: 50X60 Hub Required: XInside Diameter: 2"Outside Diameter: 12.306"Teeth: 60 Crossed From: WSS105060 , , 3016-0223 , , 6713-53313 JOHN DAY , 673-S80506000 , , 673S80506000 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Sprockets, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Hub Required: X Inside Diameter: 2" Outside Diameter: 12.306" Teeth: 60