An oversize self drilling point that is able to drill through thicker gauge steel. A hexagonal head for use with a wrench.
Heat treated for adequate strength. A proprietary coating that has similar corrosion resistance to hot dipped galvanized.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Spanner (a.k.a. snake eyes) is a tamper resistant drive that requires a special driver to install.
The most common stainless steel for general hardware use.