Daggerz™ brand deck screws are high quality fasteners for wood to wood exterior applications. The coarse threads allows for more material to sit between the threads as the screw is being installed. This deck screw features a bugle head that countersinks flush into softer wood materials. The square drive is less prone to experience slipping or "cam out". Additionally, the Tan ACQ Dagger Ultra-Guard Coating passes the 1000 hour salt spray test, provides excellent corrosion resistance, and is approved for use with ACQ lumber.