Flat heads are countersunk (cone shaped under the head) with a flat top. Star pin-in is a tamper resistant drive that requires a special driver to install.
The most common stainless steel for general hardware use.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Frearson drive is x-shaped, similar to (but not compatible with) phillips.
Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.