I believe the answer is: Sheet metal
Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.
<span> The two main islands are the North Island, or Te Ika-a-Māui, and the South Island, or </span>Te Waipounamu<span>.</span>
<span>It established the belief that not even the king is above the law.</span>
He was a strong leader and was very smart
