Galvanized steel double box rail splice bracket, you can install the box rails you need to begin installation of your new door. The adjustable bracket is made of galvanized steel for durability. • Designed for mounting a double run of National’s #5114 and #5116 box rail on buildings with corrugated metal siding • Adjustable to bring rail closer or further away from building • Suitable for use on corrugated metal siding due to narrow mounting surface • •
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