This is a A-21009432 Blade, Disc Mower, LH PN: 21009432Main Description As Following : A-21009432 Blade, Disc Mower, LH P.N: 21009432 Hole Diameter: .640"/16.2mmLength: 3.740"/95mmThickness: .139"/3.5mmType: 9 LHWidth: 1.772"/45mm Stocked As: A-76N942 , Crosses To: A-76N942 , Found in Section & Models : Hay Tool Parts > Disc Mower Blades, Sitrex MOWER, DISC: SEVERAL (Check Dimensions) Associated Items : New Also This is An Aftermarket Product And : Hole Diameter: .640" / 16.2mm Length: 3.740" / 95mm Thickness: .139" / 3.5mm Type: 9 LH Width: 1.772" / 45mm