Screws have things called threads and when you twist them into something, they get stuck inside. They work best with wood.
Screws have a helix design, that drills into the wood, and also holds materials together.
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It is a screw that has 4 threads wrapping around the shaft ( and 4 starting points) where a standard screw has just one thread that wraps around its shaft. It requires a matching nut. It travels 4...
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