Rail is part of a climbing protection system used on permanent type ladders, material is stainless steel type 316
NSN 5996-00-767-4877
NSN 5975-00-350-9289
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NSN 5945-01-047-5268
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NSN 2925-00-951-0150
NSN 5935-01-352-4717
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NSN 5945-00-755-0201
NSN 6685-01-155-1620