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#4, Phillips

US Fasteners

Wood screw

Wood screws

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

Sheet metal screws

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

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.