An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6130-01-355-9723
NSN 6610-00-138-2942
NSN 5855-01-300-2301
NSN 6685-01-246-0310
NSN 6620-01-388-1430
NSN 6105-01-610-0338
NSN 6650-00-984-5340
NSN 5965-00-752-1007
NSN 5915-00-778-8837
NSN 6240-01-274-3494
NSN 6110-01-029-3403
NSN 5960-01-261-6753