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 stainless steel for general hardware use.
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Oval heads are countersunk (cone shaped under the head) with a rounded top. Slotted drive has a simple slot for a flat bladed screw driver.
Solid brass. An alloy of primarily copper and zinc with good corrosion resistance. Used mostly in decorative and electrical applications. Exact color varies.
Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.