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. 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.