Socket caps have a small cylindrical head with tall vertical sides. Allen (hex socket) drive is a six-sided recess for use with an allen wrench (hex key).
A low carbon steel for general use. Chrome plated and polished for a mirror like finish.
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Truss heads are wide with a low profile rounded top. Spanner (a.k.a. snake eyes) is a tamper resistant drive that requires a special driver to install.
The most common stainless steel for general hardware use.