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Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood.

Sheet metal screws, Hex washer head, Steel, 5/16" x 2"

Hex washer head self drilling sheet metal screw

Self drilling

Screws with coarse threads and a drill point end for use in thicker gauge steel.

See also

Wood screw

Wood screws

Screws with a smooth shank and tapered point for use in wood.