Keep your heating system running smoothly with these radiator bleed keys. Designed to fit most radiator bleed valves, making it a tool for any home. Regularly bleeding your radiators can prevent cold spots and ensure even heat distribution throughout your home. To use, place the key into the valve and turn it to release the air. Features -Color:Black -Material:Zinc alloy -Size:2.50X2.40X0.90cm/0.98X0.94X0.35in -Durable materials: these radiator bleed keys are made from zinc alloy materials, ensuring they remain functional and reliable over time -Simple to use: the bleed valve key included in the package makes it easy for users to release air from radiators, improving their efficiency -Nice fit: these keys are designed for radiators, making them compatible with a wide range of radiator types on the market -Ample supply: you have plenty to use for multiple radiators, ensuring you are always prepared for maintenance tasks -Enhanced performance: using these keys to release trapped air can significantly improve the radiator's heat dissipation, leading to better overall list: 10 x radiator keys