Peerless-AV WMJ018 18" Wall Arm for Jumbo 2 Wall MountsThe single or double wall arms included with Jumbo 2 Wall Mounts are also available separately. The 1 1 2" 11. 5 NPT threaded fitting accepts our flush mount tube or an extension column. Comes with wood screws. 1 1 2" 11. 5 NPT threaded fitting accepts flush mount tube or extension column Peerless AV WMJ018 Specs Extension 18" 45. 7 cm Load Capacity Wood: 125 lb 57 kg Concrete: 150 lb 68 kg Weight 9. 4 lb 4. 3 kg Packaging Info Box Dimensions (LxWxH)