FastenMaster Ledgerlok 5 in. Flat Head Structure Screw, 12-Count is a code-compliant structural wood screw expertly engineered to fasten a deck ledger board to the rim joist of a house without the need for predrilling. Specifically designed for attaching deck ledgers, this fastener comes in a 5-inch length i for double ledgers and thicker applications. It features a wide washer head that can be driven flush to the ledger surface, eliminating the need for an additional washer and saving both time and money. The innovative TORX TTAP Drive System allows for efficient installation, while the proprietary three-step coating process protects against corrosion, even in pressure-treated wood. ACQ and tested to meet the latest ICC standards, the Ledgerlok Flat Head provides a durable, rust-resistant, and code-compliant connection for your decking projects. Please note, these fasteners are not for saltwater applications. Model Number: