Blocks up bridge trusses during jacking; used as a foundation for plain rollers during launch; galvanized
NSN 6620-01-133-4193
NSN 5960-01-386-5770
NSN 5975-00-961-9793
NSN 6110-01-032-2899
NSN 5945-00-296-8464
NSN 5960-00-403-3650
NSN 5905-01-083-7153
NSN 6130-01-140-0287
NSN 5895-01-631-7721
NSN 6135-01-168-2944
NSN 5930-01-054-8213
NSN 2925-01-197-7864