Pan heads are slightly rounded with short vertical sides. Phillips drive is x-shaped for installation with a Phillips screw driver.
Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use.
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.
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Screws with an Allen wrench drive.
Screws with machine threads for use with a nut or in a tapped hole.