An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6320-00-331-7138
NSN 5925-01-268-0426
NSN 6110-00-288-4179
NSN 5935-01-513-1247
NSN 5998-01-268-1452
NSN 6320-00-937-5625
NSN 4140-01-384-7778
NSN 6320-00-108-7049
NSN 5920-01-140-7297
NSN 5930-01-604-9989
NSN 6150-01-100-1673
NSN 5950-00-353-1421