An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6645-01-211-6502
NSN 6650-01-391-6072
NSN 5935-00-350-8268
NSN 5915-01-512-8851
NSN 2925-00-601-4173
NSN 5990-00-822-9269
NSN 6220-01-481-3827
NSN 5996-01-381-1997
NSN 5999-01-628-9591
NSN 6105-01-579-3695
NSN 6105-01-341-4307
NSN 6145-00-521-0001