From the product description, check product page for current description, price and availability:

• Two Tank CO2 Gas Cylinder Holder
• Holds two tanks
• Screws into anything stationary, and chain wraps around cylinder.
• This Safety Wall Bracket securely fastens a CO2 cylinder or Nitro Cylinder to the wall.
• Eliminates the risk of your CO2 tank tipping over on the ground, breaking your attached regulator.

This Co2 Gas Cylinder Holder is intended for use with up to 2 Co2 tanks. The holder can fit any tank that has a diameter of 6 1/2″, and the chain is 15.35″ in length allowing you to easily adjust for smaller sized tanks.

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