An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6645-01-461-7704
NSN 6645-00-868-1246
NSN 5855-00-004-0904
NSN 6135-00-635-9187
NSN 6645-00-106-0140
NSN 6150-01-327-0185
NSN 5920-01-417-8326
NSN 5960-01-197-4461
NSN 4140-01-121-3980
NSN 5950-01-408-6799
NSN 5999-01-591-3784
NSN 5915-01-285-5316