Replacement 18" X 3.5mm (11 Gauge) Plain Disc Blade for most disc harrows with 1" or 1-1/8" square axles.  Listing is for one 18" plain disc blade with 1-3/4" concavity, 9.0 lbs. per blade. Used by many brands including King Kutter, Tarter Gate, Behlen, Darrell Harp, Howse, Wallace, Kodiak and many more