A standoff, internally and/or externally, threaded on both ends with a hinge or pivot point to allow for independent movement of the ends.
NSN 5920-01-327-6842
NSN 6240-01-010-6890
NSN 5895-01-656-9782
NSN 5998-01-012-0491
NSN 6150-00-444-6959
NSN 5990-01-067-6015
NSN 5910-01-008-1409
NSN 6220-01-286-0562
NSN 5935-01-423-2382
NSN 6220-01-350-4668
NSN 5999-01-656-4805
NSN 6145-00-174-9344