I'm assembling a heavy duty workstation in a wood shop. Even with pre-drilled holes, these screws will lag by a factor of 1:3 at the point where the threads become the shank if enough torque is applied to drive the screw. Maybe they are too small in diameter, but they are disappointing and definitely poor hardness quality. Buy only for the softest materials and light duty OR drill pilot holes just slightly smaller than the screw. I cannot recommend these.
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