Round heads are domed and look like half of a sphere. One way drive is installed with a flat bladed screw driver but cannot be removed without special tools.
The most common
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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.