An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6110-00-467-7151
NSN 5915-01-555-8852
NSN 6110-01-415-0589
NSN 5985-01-443-0282
NSN 5998-01-455-5275
NSN 6130-01-029-6112
NSN 5945-01-514-1458
NSN 7035-01-256-3973
NSN 5996-01-089-5339
NSN 2925-01-087-4184
NSN 5999-01-557-6876
NSN 2925-01-331-5039