External Wall Plates accept most Peerless wall mount TV mounting brackets. 1/4-20 x 1/2"" screws and washers are included. Pictured (left and above left) are two wall arm styles and how they attach.- For use on 25 gauge or heavier metal studs to span load between two studs with 16"", 20"" or 24"" centers- Can also be used on wood studs- Compatible with most Peerless single wall arms- Offered with or without electrical knockouts