National Hardware Galvanized Double Round Rail Barn Door Bracket is an adjustable double round rail bracket designed for use on corrugated metal siding. It allows you to easily adjust the rail to bring it closer or further away from the building, providing flexibility for your installation needs. This bracket comes with all necessary hardware, including a lag bolt, two carriage bolts, and two nuts, ensuring a secure and reliable setup. For optimal support, it is to install one bracket every two feet of rail. The bracket also features WeatherGuard protection, making it durable and suitable for outdoor use. Model Number: N193-904