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.
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Round heads are domed and look like half of a sphere. Phillips drive is x-shaped for installation with a phillips screw driver.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
Solid brass. An alloy of primarily copper and zinc with good corrosion resistance. Used mostly in decorative and electrical applications. Exact color varies.