sale is for one ( 1 )  Disk blade. Buy one at $18.00 or buy the three for $40 Possibly McCormick-Deering IH brand ... but you decide if these fit whatever you have there. Absolutely no returns for any reason.  Please ensure these are exaclty the blades for you. These measure 13 1/2" diameter ... and the center hub square hole is about 1 1/4"