We use GRK RSS structural screws - exclusively. They take the place of lag bolts and lag screws, providing a very coarse aggressive thread with a large washer head. A special Climatek coating is approved for use in pressure treated lumber, and a star drive bit makes installation easy, with no pre-drilling.
GRK also makes the best concrete screws. We use their Caliburn screws with all of our T-REX to concrete connections. Check them out at www.GRKfasteners.com
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