This is a A-63811BH Bushing, 3/4" I.D. PN: 63811BHMain Description As Following : A-63811BH Bushing, 3/4" I.D. P.N: 63811BH New rotary cutter bushing, 3/4" I.D. Fits Bush Hog rotary cutters.Inside Diameter: 3/4"Outside Diameter: 1-1/2"Required: 2 per Hub Stocked As: A-80A612 , Crosses To: A-80A612 , Found in Section & Models : Hay Tool Parts > Rotary Cutter Parts, Bush Hog ROTARY CUTTER: SEVERAL Associated Items : New Also This is An Aftermarket Product And : New rotary cutter bushing, 3/4" I.D. Fits Bush Hog rotary cutters. Inside Diameter: 3/4" Outside Diameter: 1-1/2" Required: 2 per Hub