Bought this as a replacement blade for a Lawnboy 10323(Duraforce 6.5hp silver). It was a tiny bit too long on the back end of the blade and fouled on the deck.I was able to make it work with a bit of time on the angle grinder, but still disappointing to need to do that to a brand new blade.Installation was incredibly easy, although I did need to borrow a neighbor’s 1” wrench to remove my old blade. Has worked great and made mowing much better! Previously my mower kept dying on me when mowing a thicker portion of my lawn.Seems to dull fastPerfect for as a replacement for OEM blade for my Lawn boy mower.I bought this blade to fit a 21" OMC made 21" model 7072 Lawn boy, and it is an Exact replacement for the original blade.It is even pretty well balanced, and i would buy it again.It's a mower blade. It fits and works as designedThis fit our 1974 Lawn Boy perfectly. With thee blades, you do not need to use the original blade stiffener or washer, just the blade adapter, blade and nut.I could have used at least another week. Now I have no more excuses not to cut the lawn.