This is a A-UFO141 Blade, Disc Mower PN: UFO141Main Description As Following : A-UFO141 Blade, Disc Mower P.N: UFO141 Dim A (1): 4.02" / 102mmDim B (2): 1.77" / 45mmDim C (3): .16" / 4mmDim D (4): .649" / 16.5mmType: NO. 1 LH/RH Found in Section & Models : Hay Tool Parts > Disc Mower Blades, Reese MOWER, DISC: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 4.02" / 102mm Dim B (2): 1.77" / 45mm Dim C (3): .16" / 4mm Dim D (4): .649" / 16.5mm Type: NO. 1 LH/RH