Round heads are domed and look like half of a sphere. Combination drive can be used with either a flat bladed or phillips screw driver.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Oval heads are countersunk (cone shaped under the head) with a rounded 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.