This is a A-7A6009 Spacer PN: 7A6009Main Description As Following : A-7A6009 Spacer P.N: 7A6009 For 1/2" Blade Replaces: 22132SW SIDEWINDER , Crossed From: 22132 , , 873-22132 , Found in Section & Models : Miscellaneous > Miscellaneous, Mono (UNDEFINED): VARIOUS MODELS, Sidewinder ROTARY CUTTER: 6X6 Associated Items : New Also This is An Aftermarket Product And : For 1/2" Blade Height: 1" Outside Diameter: 2.5"