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Big Timber - 350 Count - #10 x 3-1/8" SWD: Soft Wood Deck ScrewHeat-treated hardened steel for high tensile strength and high shear strength. Triple layer ACQ compatible bronze coating for exterior or interior use. Deep six-lobe star drive recess reduces cam-out end load. Handles 2X the torque as Phillips or Square Drive while extending the life of the bit. Under-head cutting nibs to aid in self countersinking. Duo-thread design is great for: Proper seating, Back-out feature for floor joists that are missed during fastener installation, Helps to prevent spinouts in soft wood and end grain. Aggressive knurl enlarges hole to reduce splitting and drag to help draw lumber together. V-cut notches on threads to cut fibers for easier insertion at a lower torque. Type-17 tip for faster precise starts which eliminate "walking". (Provides easier insertion without pre-drilling) Aggressive thread for great withdrawal strength. International Building Code and International Residential Code compliantCOMMON USES INCLUDE: Decking Boards, Cedar, Redwood, Treated Lumber, Exterior and Interior Wood Framing, Subfloor installation, General Wood ConstructionNOTE: Always follow lumber manufacturer's recommendations.