These knives seem to be 4 1/8 x 2 1/8 and a little less than 1/2" thick. But they are worn a lot. One hole in the back holding it in place. Anyone know what knives this is? There's no number or brand on it. The closest thing I found was 4 1/4 x 2 3/8 x 1/2" on treestuff and its for a limbco chipper. I figure this must be it because it's the closest size and it has only one hole like mine. Just hoping for some input. Thanks.