This is a A-05869921 Blade, Disc Mower, RH PN: 05869921Main Description As Following : A-05869921 Blade, Disc Mower, RH P.N: 5869921 Hole Diameter: .826"/21mmLength: 3.937"/100mmThickness: .157"/4mmType: 10 RHWidth: 1.85"/47mm Found in Section & Models : Hay Tool Parts > Disc Mower Blades, Marangon MOWER, DISC: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Hole Diameter: .826" / 21mm Length: 3.937" / 100mm Thickness: .157" / 4mm Type: 10 RH Width: 1.85" / 47mm