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 7035-00-104-7613
NSN 2925-00-831-7024
NSN 5950-01-542-9358
NSN 5999-01-171-7558
NSN 2925-00-957-7329
NSN 4140-00-196-7139
NSN 6610-01-198-3862
NSN 5998-00-100-0491
NSN 5996-01-141-7959
NSN 6620-01-651-5425
NSN 5930-00-992-5514
NSN 5855-01-530-3172