The Axia Alloys billet headset / goggle hangers can mount to any size tube using our patented modular roll cage clamping system. This hanger is positioned parallel to the mounting bar(Perpendicular to bar also available). The mounting clamps are low profile enough to fit under roofs and other accessories mounted to the roll cage. They are designed to have close tolerances between the top of the hanger and the bottom of the mounting tube so that it uses the padding on your headset to keep them in position while driving. The hook on the end of each side will keep thinner headsets and goggles from falling off as well. Sold Each.