An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 5920-00-142-4851
NSN 6610-01-514-0745
NSN 6645-01-039-4259
NSN 5975-01-379-7230
NSN 6130-01-627-9686
NSN 2925-01-578-7731
NSN 6650-01-343-8008
NSN 6220-00-556-8200
NSN 6150-00-853-0185
NSN 6650-01-590-3670
NSN 6220-01-406-5351
NSN 4140-01-438-0778