1：Aluminum Alloy Cylinder Tank Dolly:Plenty of Storage Space : It can hold the gas cylinders tightly to prevent them from moving and falling, you can safely store multiple gas cylinders and keep your gas cylinders in a safe and organized manner 2：Mobile Cylinder Tank Rack:WIDELY APPLIED: The floor stand is ideal for storing various gas cylinders (such as gas, oxygen, nitrogen and acetylene). It can be used in schools, laboratories, factories, hospitals, etc 3：Foldable Gas Cylinder Fixed Rack:PRE-DRILLED DESIGN: There are holes on the bottom plate of the gas cylinder rack to fix the rack on the ground (with expansion screws). No need to install the gas cylinder rack when you receive it, just open it and use it 4：Propane Tank Storage Rack:STEEL FRAME CYLINDER HOLDER: Sturdy oxygen cylinder holder is made of steel with high load capacity, comes with a galvanized process rust-proof double chain locking chain to increase the stability of the holder 5：Rolling Oxygen Cylinder Cart:ADJUSTABLE PROTECTIVE CHAIN: Equipped with adjustable protective chain, you can adjust the length of the chain according to your needs, even if the gas cylinder is tilted, it will not slip out