All-Match Design: Industrial grade black powder coat finish provides good looks and a durable appearance for indoor or outdoor use. At the same time, black powder coating provides rust protection. Practical Design: Easy-to-install, wide and deep U-shaped door brackets make these security door brackets easy to install on doors, extra thick metal for door reinforcement and home security. Wide applications: ideal for securing barn doors, sheds, garage doors, gates garden, fence doors, basement doors, warehouses, etc.