Self drilling screws have a drill bit point. Pan heads are slightly rounded with short vertical sides. Star drive is a Torx® compatible drive, designed to minimize the risk of cam-out (stripping).
A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion.
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Oval heads are countersunk (cone shaped under the head) with a rounded top. Phillips drive is x-shaped for installation with a phillips screw driver.
The most common stainless steel for general hardware use.
A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments. More expensive than 18-8.