GRK screws are strong and self-tapping. The notch on the front of the screw helps remove material to keep the wood from splitting. The thick, wide head is ideal for preventing pull-through by acting like a washer. The shell is really hard. I had it outside in PT wood and the finish is strong and there has been no sign of rust after 6 months. Only 4 stars because the included red bit fits the magnetic holders a little loosely and the clip doesn't hold the bit no matter which holder I try.
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