An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6620-00-952-4278
NSN 5950-01-346-1460
NSN 4140-00-464-7890
NSN 5925-00-302-4637
NSN 6645-00-229-1521
NSN 5925-00-203-1278
NSN 5965-00-332-8698
NSN 5915-01-092-6443
NSN 5835-01-264-8782
NSN 5930-01-103-2642
NSN 5895-01-127-8134
NSN 5905-01-370-4989