Flat heads are countersunk (cone shaped under the head) with a flat top. Square drive is designed to reduce the risk of cam-out (stripping) and allow single-handed installation.
Stainless steel 18-8
The most common stainless steel for general hardware use.
Zinc plated steel
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.
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.
Stainless steel 18-8
The most common stainless steel for general hardware use.
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