Self drilling screws have a drill bit point. A hexagonal head for use with a wrench.
A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Square drive is designed to reduce the risk of cam-out (stripping) and allow single-handed installation.
The most common stainless steel for general hardware use.