FastenMaster Ledgerlok 3-5/8 in. Flat Head 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 screw replaces traditional lag screws and through-bolts, ing a more efficient and reliable fastening solution. Featuring a wide washer head that drives flush to the ledger surface, it eliminates the need for an additional washer, saving both time and money during installation. The screw also incorporates the TORX TTAP Drive System for easy and secure driving. Coated with a proprietary three-step process, it provides excellent corrosion resistance, even in pressure-treated wood, and is ACQ . The Fastenmaster Ledgerlok is tested and supported by engineering data that meets the latest ICC standards, ensuring a strong, code-compliant connection for your deck ledger installation. This product is not for saltwater applications. Model Number: