An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6240-01-400-4212
NSN 6150-01-554-5683
NSN 6620-01-158-7309
NSN 6220-01-657-0668
NSN 5960-00-996-0681
NSN 5855-01-491-0140
NSN 4140-01-199-4589
NSN 5895-00-665-0054
NSN 5965-01-545-3629
NSN 6650-01-657-1395
NSN 5895-01-442-6518
NSN 6135-00-983-9187