1：Pre-drilled Holes Design --- There are 2 holes on the back plate and 2 holes on the base plate of the air cylinder holder to fix the air cylinder holder to the wall or floor. The air cylinder holder does not need to be installed upon receipt, it can be opened and used. 2：Curved Design --- It not only increases the stability of the bottle holder, but also can be close to the bottle body to prevent the gas cylinder from shaking and avoid safety accidents. 3：Versatile Usage --- Suitable for both indoor and outdoor use, ideal for storing various cylinders such as gas, oxygen, nitrogen, and acetylene. 4：Steel Material --- The Gas Cylinder Storage Rack is made from 32 mm thick steel tubing with a powder coated surface, which not only provides good durability, but also prevents chips and scratches, ensuring long term reliability 5：Adjustable Protective Chain --- The cylinder bracket features with adjustable protective chain, you can adjust the length of the strap according to your needs.It can fixed the tanks tightly. Prevent the cylinder from moving and falling