Camo exterior fasteners are designed specifically for exterior projects. Each screw starts fast, holds strong, and is backed by a Camo warranty against rust and corrosion so you can confidently use them in all of your decking projects, substructures, landscaping, fences, pole barns and more.5/16 in (7.9 mm) structural screws for fastening ledger boards, multi-ply sawn and structural composite lumber beams, and other interior and exterior construction projectsReplaces 1/2 in lag screws in general construction projectsSharp point starts fast with no predrillingSlashes reduce splittingLarge flat head maximizes pull-through holding power and finishes flush with work areaT-40 star drive reduces cam outs and excessive wear on bitCoated with our proprietary PROTECH Ultra 4 coating system, which features four layers that combine to provide the ultimate corrosion protection