It is integrated during manufacture to allow for wall mounting on a standard CO2 bracket such as this one. Simply place the opening over the hook of the CO2 bracket. We also stock a larger CO2 bracket that will accommodate the larger 5kg CO2 extinguishers. Sold in packages of 20 brackets. Not compatible with powder, water, foam or 5kg CO2 types of fire extinguishers. Our fire extinguishers are all supplied with wall-fixing brackets as standard.