Suitable for both outdoor and indoor use, this gas cylinder rack can be used to safely store helium, hydrogen, acetylene and various other gas cylinders and tanks. Specifications: Material: Steel Color: Blue Capacity: 1/2/3 x 40L gas cylinder Inlet diameter: 27cm/10.6 inches Fixing hole diameter: 10mm Installation: Wall-mounted Usage: Storage of nitrogen/hydrogen/acetylene and other gas cylinders Size: 1 bottle - 35x20cm/13.8x7.9 inches 2 bottles - 65x20cm/25.6x7.9 inches 3 bottles - 95x20cm/37.4x7.9 inches Features: 1. Can store any 40L gas cylinder 2. Keep gas cylinders organized and save space 3. Made of tough steel for long-lasting durability and safety 4. Keep gas cylinders firmly upright for easy storage and transportation Package Included: 1 x Gas Cylinder Holder (Note: This product does not include gas cylinders) Tips: 1. Manual measurement, there will be an error of 1-3 cm, please understand 2. Due to different light and personal understanding of color, there will be small color difference, please refer to the actual object