An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6650-00-107-1667
NSN 6150-00-981-3480
NSN 5945-01-170-2111
NSN 5925-00-660-7589
NSN 5990-01-502-8209
NSN 5999-00-936-1263
NSN 5905-00-272-9259
NSN 5910-01-416-2248
NSN 2925-01-440-9912
NSN 6145-00-138-4658
NSN 6620-01-246-4314
NSN 5835-01-020-5650