An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 5915-01-392-6398
NSN 6645-01-440-8624
NSN 5920-01-222-9456
NSN 5835-01-257-5342
NSN 5905-01-248-9765
NSN 6620-00-262-3113
NSN 5920-00-064-3523
NSN 5985-00-188-9665
NSN 6650-00-003-5413
NSN 5895-01-360-6739
NSN 6105-01-423-9451
NSN 6220-01-306-9728