An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6240-01-436-4649
NSN 5975-01-486-3345
NSN 7035-01-227-7492
NSN 7035-01-028-4966
NSN 6685-00-728-4744
NSN 5945-00-461-2547
NSN 6110-00-271-9928
NSN 6650-00-077-0638
NSN 6110-01-029-5127
NSN 6320-00-116-3658
NSN 6145-01-555-8131
NSN 5925-01-301-2920