This is a A-50X48 Sprocket PN: 50X48Main Description As Following : A-50X48 Sprocket P.N: 50X48 Hub Required: XInside Diameter: 2"Outside Diameter: 9.911"Teeth: 48 Crossed From: WSS105048 , , 3016-0218 , , 6713-53163 JOHN DAY 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: 9.911" Teeth: 48