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Amazon.com: 15x3-1/2" Black Wafer Head Structural Lag Screws. Used for Log Construction, Timber Framing, Laminated Beams and Pole Barns Among Other Uses. T-30 Torx/Star Drive (~50 Count) : Grocery & Gourmet Food
Why Nails are Used Instead of Screws in Framing - McNair Custom Homes
EXTREME XTC™ DECKING AND FRAMING SCREWS #10 x 3.5"