An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 5915-00-731-6391
NSN 5910-01-558-7896
NSN 6620-01-431-9176
NSN 6145-01-445-4707
NSN 5975-00-954-8549
NSN 6135-01-361-7567
NSN 5998-01-202-7905
NSN 6150-00-279-6510
NSN 6240-01-417-1933
NSN 5950-01-617-7680
NSN 6685-00-058-9526
NSN 5990-01-609-4793