These Pinnacle Hardware wood screws are used specifically for fastening into timbers. They have a relatively wider thread pitch than a metal screw to prevent the wood between the threads being torn away over a period of time.
Deckmate #9 x 3 in. Black Star Flat-Head Wood Deck Screw (5 lbs
Pinnacle 3.5 x 20mm Black Round Head Timber Screw - 30 Pack
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