Not all shelter frames are created equal. Our ultra strong ShelterTube Square Tube steel series frame is constructed of serious high grade steel. Innovative features like reinforced rafter braces on the 18 and 24’ Wide models, bolt hardware at every connection point and a one piece solid steel base rail for quck and easy installation make ShelterTube a great option for any storage application. Available in 12’, 18’ and 24’ widths based on most relevant applications and popular size configurations.