The radiator air key is a practical tool for ensuring your heating system operates efficiently. By using this bleed your radiators, you can prevent cold spots and improve overall heat distribution. Made from metal, it is designed for long-term use. Its simple design makes it easy to handle, making radiator maintenance a breeze for any user. Features -Color:Silver -Material:Copper -Size:3.80X3.50X0.90cm/1.49X1.38X0.35in -Note: 5mmX5mm square calibers -sturdy build: constructed from sturdy materials, this radiator bleed key ensures durability and long term use. -Effortless to use: the bleed key makes radiator maintenance and easy for all users -Application: It is designed to fit radiator bleed valves, making it a addition to your tool - : The key's metal construction ensures longevity, while its design allows for easy operation -Multifunctional: compatible with various taps and radiators, it can also serve as a wrench for different valve types Package list: 1 x radiator accessories