This is a A-50X38 Sprocket PN: 50X38Main Description As Following : A-50X38 Sprocket P.N: 50X38 Hub Required: XInside Diameter: 2"Outside Diameter: 7.918"Teeth: 38 Crossed From: WSS105038 , , 3016-0209 , , 6713-52763 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: 7.918" Teeth: 38