An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 6620-01-630-6759
NSN 6135-01-505-9332
NSN 5935-01-475-2810
NSN 6150-00-824-8626
NSN 6105-00-897-7380
NSN 6650-01-422-1037
NSN 6150-00-870-7127
NSN 6645-01-244-4849
NSN 6130-01-400-6123
NSN 5905-01-366-4523
NSN 6145-00-180-9815
NSN 6110-01-385-6856