Code-compliant and exterior-coated, CAMO 5/16 in. Multi-Ply Screws hold strong and finish flush in a variety of applications. Our 4 in. Multi-ply plus Ledger screw is specifically designed to fasten interior corridor ledgers. They can also be used as a replacement for 1/2 in. lag screws in general construction projects. They are third-party tested and certified IBC and IRC code compliant. These screws feature our industry-leading PROTECH Ultra 4-layer coating system, offering superior corrosion resistance for long-lasting connections. CAMO Structural screws are engineered to start fast, drive easy and finish flush so you can get the job done and get on your way.