self tapping screws and self drilling screws/button head screws

Button head screws also called wafer head screws, k lath screws, and truss head screws, including self tapping screws and self drilling screws. Self tapping screws are directly threaded after the head of the screw is made. Tapping screw display:
The difference between self drilling screws and self tapping screws the tips of the screws. When the head of the screw is made, it needs to be drill made and then threaded.
Self drilling screw test:
In our exports, customers' demand for self tapping screws is higher than that of self tapping screws.
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