This is a A-60X20 Sprocket PN: 60X20Main Description As Following : A-60X20 Sprocket P.N: 60X20 Hub Required: XInside Diameter: 2"Outside Diameter: 5.186"Teeth: 20 Crossed From: WSS106020 , , 20006020 , , 20006020 , , 2827-41827 JOHN DAY , 3016-0236 , , 6713-54063 JOHN DAY , 673-S80602000 , , 673S80602000 , 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: 5.186" Teeth: 20