FastenMaster Ledgerlok 5 in. Structure Screw, 12-Count is a code-compliant structural wood screw designed specifically to fasten a deck ledger board to the rim joist of a house without the need for predrilling. This innovative screw serves as a reliable for lag screws and through-bolts, featuring a proprietary three-step coating process that superior corrosion resistance, even when used in pressure-treated wood. It is fully for use with ACQ treated lumber, ensuring durability and long-lasting performance. The built-in washer head eliminates the need for an additional washer, saving both time and money during installation. Additionally, the large hex-head design provides greater bit engagement, reducing the chance of cam-out and making the fastening process smoother and more efficient. Ledgerlok is supported by engineering data that meets the latest ICC standards, ing a code-compliant and secure connection for your decking projects.