This Oxygen Cylinder Rack from Drive Medical is a great choice when you need to store many oxygen cylinders. Supporting cylinders of size E, D, C, or M9, this rack is versatile and space-saving. The rack holds a maximum of 20 cylinders. Comes with bolt down feet|Chrome plated finish, alloy carbon steel|Reinforced double bar shelf frames|Modular design saves on shipping|Assists in OSHA compliance