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Big Timber - 5LB - #9 x 3-1/8" YTX: Interior Multi-Purpose Wood ScrewHeat treated hardened steel for high tensile strength and high shear strength. Gold zinc coating for interior wood construction 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. 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 lower torque. Type-17 tip for faster precise starts which eliminate "walking". (Provides easier insertion without pre-drilling) Aggressive thread for great withdrawal strength. Structural wood screw - backed by certified independent testing (TER 1911-01). International building code and international residential code compliant.COMMON USES INCLUDE: Log construction, Timber frames, Laminated beams, Girders, Ledger boards, Stair rails, SIP Panels, Pole barns.NOTE: Always follow lumber manufacturer's recommendations.