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These steel screws have corrosion-resistantfinishes.Also known as lagbolts,they have a hex head for a secure grip with awrench.They press threads into material for atight,securehold.To preventsplitting,drill a pilot hole slightly smaller than thescrew.Length is measured from under thehead.
Hot-dipped galvanized steel screws have a thick coating for better corrosion resistance than zinc-plated steelscrews.They'rea good choice for ACQ-treated(arsenic-free)lumber.