Oversize truss heads have a wide head with a low profile rounded top. Phillips drive is x-shaped for installation with a Phillips screw driver. Serrated heads have angled serrations under the head to resist loosening.
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Button heads are rounded and low profile. Allen (hex socket) drive is a six-sided recess for use with an Allen wrench (hex key).
Flat heads are countersunk (cone shaped under the head) with a flat top. Allen (hex socket) drive is a six-sided recess for use with an Allen wrench (hex key).