Designed for pocket-hole systems, Kreg pocket-hole screws increase the strength of a pocket-hole joint. Cut-thread pattern prevents splitting. Coarse thread is for any combination of softwoods, plywood, and composites, and fine is for hardwoods.
I noticed this too late to return my order, but the screws I received had heads that looked like a combination of square and phillips drive. They didn't work well with a #2 square driver or a phillips driver bit.
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