Flat heads are countersunk (cone shaped under the head) with a flat top. Phillips drive is x-shaped for installation with a Phillips screw driver.
Also known as A-4 stainless, 316 is a highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments.
Flat heads are countersunk (cone shaped under the head) with a flat top. Star drive is a Torx® compatible drive, designed to minimize the risk of cam-out (stripping).
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Screws with an Allen wrench drive.
Screws with machine threads for use with a nut or in a tapped hole.