Steel cylinder support: The oxygen cylinder trolley is made of 2 mm (0.99 inch) thick steel. Adjustable chain: The cylindrical bracket features a 60 cm (23 3/5 inch) adjustable chain at both the top and bottom, allowing you to adjust the strap length as needed. Applications of the oxygen cylinder rack: This oxygen cylinder rack can accommodate 40-liter/50-liter oxygen cylinders and is suitable for storing and transporting oxygen, nitrogen, and propane cylinders. Equipped with 20 cm (8 inch) diameter rubber wheels: The tire bearings are made of iron, and the wheel surface is 42 mm (1 3/5 inch) wide, making it quiet and smooth for transporting oxygen cylinders, saving you time and effort. Lightweight and portable, it is perfectly compatible with transfer chairs and walkers.