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 5905-01-477-1482
NSN 7035-01-361-8821
NSN 5960-01-512-0233
NSN 5965-01-382-9081
NSN 6620-01-074-9377
NSN 5998-00-085-2130
NSN 6685-00-162-8077
NSN 6145-00-617-4032
NSN 6105-01-383-6534
NSN 6145-01-401-3713
NSN 5915-01-261-1777
NSN 6620-01-466-4436