A slotted hex washer head can be installed with either a wrench or a flat bladed screw driver, and has a built-in washer.
The most common stainless steel for general hardware use.
Heat treated for adequate strength. 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.