Dometic 20' Awning Aluminum Roller Tube - 3108346.020Dometic's aluminum roller tubes are made to fit most standard size patio awnings. This roller tube will measure approximately 19' 6" in length (+ 5 16") and is made to fit an awning that measures 20' from center of the left hand awning arm to center of the right hand awning arm. The diameter of this roller tube is approximately 3 1 2" (+ 1 8") and has 3 channels for the poly cords that are sewn into your existing awning fabric and or LED light strips