Sex bolts
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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 prevent loosening.
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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 prevent 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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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).
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