Sold as 1 Each. TV SIZE RANGE: 23' to 55' LED LCD PLASMA TVs. SWIVEL: +/- 90 degrees. LOCKABLE ARM: Locks for transportation. VESA COMPATIBILITY: 75x75,100x100,200x100,200x200,300x300,400x200,400x400 (mm). EXTENSION: 2.3' to 15.7'. Fits Samsung, Sony, LG, Vizio, TCL, Element, Sceptre, HiSense and other TV brands. TILT: +10/- degrees. Supported by manufacturer's limited lifetime warranty.