Big Timber No. 15 X 4-1/2 in. L Star Black Structural Wood Screws 400 pk

Heat-treated hardened steel for high tensile strength and high shear strength. ACQ compatible ruspert coating in an attractive matte black finish useful with many brands of outdoor or indoor decorative hardware. Handles 2X the torque as phillips or square drive while extending the life of the bit. Aggressive knurl enlarges hole to reduce splitting and drag to help draw lumber together. Built-in flat washer head to increase pull through strength and leaving behind a smooth flush head.