This is a A-40X48 Sprocket PN: 40X48Main Description As Following : A-40X48 Sprocket P.N: 40X48 Hub Required: XInside Diameter: 2"Outside Diameter: 7.927"Teeth: 48 Crossed From: WSS104048 , , 20004048 , , 20004048 , , 3016-0174 , , 6713-51063 JOHN DAY , 673-S80404800 , , 673S80404800 , 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: 7.927" Teeth: 48