Mating screws
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Truss heads are wide with a low profile rounded top. Combination drive can be used with either a flat bladed or Phillips screw driver.
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Truss heads are wide with a low profile rounded top. One way drive is installed with a flat bladed screw driver but cannot be removed without special tools. 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).
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