Daggerz 1 4" x 3 1 2" Self Drilling Plywood to Metal Screw with Wings, Star Flat Head ACQ Dagger Ultra Guard Coating, Qty. 900 DSC Drag Strut Connectors Light Duty Strength: Made from 22 gauge Light Duty Strength: Made from 22 gauge steel to handle lighter load requirements where heavier straps aren’t needed Alignment: The joist should be fully seated within the hanger for a flush The proprietary ACQ Dagger Guard coating passes the 1000 hour salt spray test and provides excellent corrosion resistance and is approved for use in ACQ lumber The wings on the screw point are designed to ream a larger hole in the wood and break off when they hit the metal so the wood can be drawn tight to the steel