This is a A-50X24 Sprocket PN: 50X24Main Description As Following : A-50X24 Sprocket P.N: 50X24 Hub Required: XInside Diameter: 2"Outside Diameter: 5.123"Teeth: 24 Crossed From: WSS105024 , , 20005024 , , 20005024 , , 2827-40427 JOHN DAY , 3016-0195 , , 6713-52063 JOHN DAY , 673-S80502400 , , 673S80502400 , 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: 5.123" Teeth: 24