This radiator air vent key is an indispensable tool for maintaining the efficiency of your heating system. By using this release air from your radiators, you can enhance heat output and reduce energy consumption. The key is made from metal, ensuring it can handle frequent use. Its practical design makes it easy to use, even for those new to radiator maintenance. Features -Color:Silver -Material:Copper -Size:3.80X3.50X0.90cm/1.49X1.38X0.35in -Note: 5mmX5mm square calibers -Sturdy materials: made from sturdy materials, this radiator bleed key is designed for durability and use. -Simple to operate: the included bleed key allows for easy and efficient radiator maintenance, suitable for all users. -Improved efficiency: using these keys to release trapped air can significantly enhance the radiator's heat dissipation, leading to better overall performance -Easy to use: the bleed valve key makes it simple to release air from radiators, improving their efficiency and performance -Broad compatibility: this key is compatible with various taps and radiators and can also be used as a wrench for different valves Package list: 1 x radiator accessories