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Hot-Dipped Galvanized Steel screws have good chemical resistance and are a good choice for ACQ-treated(arsenic-free)lumber.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.They may be mildlymagnetic.Length is measured from under thehead.