FastenMaster Ledgerlok 3-5/8 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 protects against corrosion, even when used with pressure-treated wood, and is for ACQ lumber. The built-in washer head eliminates the need for an additional washer, saving both time and money during installation. Its large hex-head design allows for greater bit engagement, which reduces cam-out and enhances driving efficiency. LedgerLOK is backed by engineering data conforming to the latest ICC standards, ensuring a code-compliant connection for your structural fastening needs. Model Number: