This is a A-16197SW Spacer PN: 16197SWMain Description As Following : A-16197SW Spacer P.N: 16197SW For 3/8" Blades Found in Section & Models : Hay Tool Parts > Rotary Cutter Parts, Mono ROTARY CUTTER: SEVERAL (W/ 3/8" Blade), Sidewinder ROTARY CUTTER: SEVERAL (W/ 3/8" Blade), Sidewinder ROTARY CUTTER: 6X6 Associated Items : New Also This is An Aftermarket Product And : For 3/8" Blades Height: .91" Inside Diameter: 1.013"-1.016" Outside Diameter: 2.5"