They fit Kreg square head screws. Tested - the magnets work, the drive heads fit and I was able to pull the screw out and intentionally overtighten where the wood was damaged and the bit wouldn't slip off. I'm not sure about the durability as I haven't used it much. They look a little rough after editing, with visible horizontal grooves at the tip where it should have been smooth. The fit and smoothness are definitely not as good as the Kreg. Will they work? Yes. Will I recommend you? Well, even though I have this set, I ordered the Kreg set just because I'm into woodworking as a hobby and want tools that I really enjoy using. My Kreg racquet has easily driven hundreds of screws and is still in perfect condition (ordered extra in case I lose my racquet and it's on sale).
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