I ordered a flat screen mounting bracket which purported to rotate 360 degrees and to accommodate screens up to 70". The mounting brackets which affixed to the back of the screen were only minimally adjustable and, once installed, placed the rotational hub off center from top to bottom so when the screen is turned 90 degrees it is weighted to one side of center and will not stay oriented as desired. There is a so called "locking" mechanism consisting of a spring loaded button which will not hold the screen in any position. I will be returning my purchase.