Crimson AV AD400 VESA 400x400mm Adapter Extender VESA compatible, Attaches directly to any mount with 200x200mm hole pattern to extend adapter up to 400x400mm Attaches directly to any mount with 200x200mm hole pattern to extend adapter up to 400x400mm Max mounting pattern 400x400mm TV size range 32 - 55 VESA mounting patterns 300x200mm, 300x300mm, 400x300mm, 400x400mm