Rail is part of a climbing protection system used on permanent type ladders, material is stainless steel type 316
NSN 6130-01-436-8158
NSN 6650-01-084-9726
NSN 6135-01-630-7662
NSN 5965-01-323-0501
NSN 5855-01-624-6804
NSN 6150-01-112-0540
NSN 5960-00-506-1295
NSN 6610-01-381-3181
NSN 6320-00-456-0836
NSN 6610-00-500-6944
NSN 6150-01-634-0575
NSN 5930-00-473-5311