5400, 12', Galvanized, Plain Round Rail, Designed For Doors Weighing Up To 600 LB Per Panel, Can Be Used With Various Types Of Single, & Multiple Brackets, Advanced Rail Design With Flat Top & Sides For Easier Mounting & Better Stability, Self Cleaning & Smoother Operation, Interchangeable With Other Brands Of Round, Rail, Manufactured From Galvanized Steel, Loose.