Blocks up bridge trusses during jacking; used as a foundation for plain rollers during launch; galvanized
NSN 5935-01-347-5853
NSN 5835-01-071-9310
NSN 5855-00-281-3843
NSN 6105-01-189-7340
NSN 6130-01-381-0207
NSN 5910-00-486-0921
NSN 5855-00-361-0167
NSN 5975-00-500-0166
NSN 5910-01-200-9544
NSN 6105-01-569-0750
NSN 5996-01-050-3141
NSN 6240-01-260-3597