These WoodSpur screws are most useful when building timber structures, timber framing and wooden outdoor projects. They are available in a large gauge and longer lengths suitable for their intended use. The material chosen for the WoodSpur Outdoor screws is AISI 410 stainless steel. This is a nickel-martensitic stainless steel that provides high corrosion resistance. In addition, it combines high strength and hardness, making it an ideal choice in this application. For even greater corrosion protection, the screws have a Dacromet coating. The Dacromet coating can pass the salt-spray test 500 to 1,000 hours, which far exceeds the resistance of common yellow passivated screws. Dacromet is the leading coating specified by automotive companies worldwide in situations where corrosion protection is vital. Other benefits include a lower friction coefficient, a useful property when using battery-powered screwdrivers. It is easily over-painted; unlike PTFE coatings, paint sticks to the Dacromet. Suitable for all outdoor projects, from a simple gazebo to a new timber workshop. Use WoodSpur Outdoor screws for all your timber-framing needs.