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.
Pan heads are slightly rounded with short vertical sides. 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.
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