Flat heads are countersunk (cone shaped under the head) with a flat top. Star pin-in 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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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.