This is a A-9520420 Blade, Disc Mower, RH PN: 9520420Main Description As Following : A-9520420 Blade, Disc Mower, RH P.N: 9520420 Dim A (1): 4.528" (115mm)Dim B (2): 1.850" (47mm)Dim C (3): .157" (4mm)Dim D (4): .748" (19mm)Type: NO. 10 RH Found in Section & Models : Hay Tool Parts > Disc Mower Blades, Claas MOWER, DISC: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 4.528" (115mm) Dim B (2): 1.850" (47mm) Dim C (3): .157" (4mm) Dim D (4): .748" (19mm) Type: NO. 10 RH