This is a A-SQX1-14 X Hub PN: SQX1-14Main Description As Following : A-SQX1-14 X Hub P.N: SQX1-14 Bore: 1-1/4" square Crossed From: WSH3S020 , , 6713-59713 JOHN DAY Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Hubs, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Bore: 1-1/4" square