It is Strongâ„¢ Mount Adapter Plates for Converting 200mm x 200mm VESA up to 400mm x 400mm VESA. The great thing with standards is that there are so many to choose from. In order to meet the never-consistent VESA mounting patterns of displays, the Strongâ„¢ SM-ADP-M-400X400 adapter plates give you greater flexibility beyond the the mount's standard 200X200 pattern.
The Premier team has been stellar and attentive to every single need we have had and were on site during the entire construction of our home to insure first class install and service.