Hex head lag bolts are also called hex head lag screws and are recommended for all types of wood or metal to wood construction where standard wood or deck screws are too short or light and where nails or spikes lack sufficient strength. They can be installed in wood with pre-drilled pilot holes or in masonry with lag shields. 18.8 stainless steel has excellent outdoor and chemical resistance and may be mildly magnetic. Used in all exterior applications where prolonged exposure to the elements are present. Ideal for exterior use such as landscaping projects including decks, fences, furniture and anywhere corrosion is of concern.