This is a A-60X42 Sprocket PN: 60X42Main Description As Following : A-60X42 Sprocket P.N: 60X42 Hub Required: XInside Diameter: 2"Outside Diameter: 10.458"Teeth: 42 Crossed From: WSS106042 , , 3016-0258 , , 6713-55013 JOHN DAY , 673-S80604200 , , 673S80604200 , 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: 10.458" Teeth: 42