I've had my Grizzly G0452 jointer for about 9 years now, and these are the knives that go with it. Brand new they cut glass smooth and leave a nice flat surface. However, sometimes it seems like they chip or nick easier than I'd like. Even so, they aren't that expensive. The biggest hurdle is installing them so they're even with the outfeed table, and that's not the product's fault. It's just the nature of setting jointer knives most of the time! Anyway, these work well, and I like the surface they leave, especially when brand new!