An externally threaded fastener bent approximately 180 degrees (3.141 radians) in the shape of the letter u and with both ends threaded.
NSN 5990-01-561-0737
NSN 6685-00-188-1991
NSN 6130-00-392-5990
NSN 6145-01-230-0058
NSN 6145-01-200-7936
NSN 5960-01-066-2300
NSN 6135-01-421-4855
NSN 6685-01-209-4683
NSN 6650-01-361-0723
NSN 6240-01-249-9840
NSN 6150-01-542-5159
NSN 6135-00-369-2368