The Drive Medical's Oxygen Cylinder Rack is made of chrome-plated steel and is a secure way to transport or store multiple oxygen cylinders. This rack has slots for 12 oxygen cylinders and can support both D and E cylinders. The rack even comes with mounting brackets on the underside, so that it can be installed in a truck. Backed by a limited lifetime warranty from Drive Medical, a leading brand of respiratory products and other medical goods for more than 20 years, you can purchase with confidence.