HIGH-QUALITY RADIATOR KEY: Using the key can prevent annoying noises in the radiator and increase efficiency. High-quality craftsmanship makes it easy to use, allowing for simple ventilation without much effort. EASY TO USE: The universal radiator vent key has a robust, easy-grip shape and is designed to easily and effectively vent your radiator, restoring heat flow throughout your home for greater comfort and a warmer home. DURABLE AND LONG-LASTING: Our radiator vent key set is made from high-quality zinc alloy, ensuring they will last a long time and handle even the toughest jobs. The holes on top make them easy to hang on a keychain, carry, and store, preventing loss. PRODUCT SIZE: Our radiator keys come in a pack of 3, providing spare keys in case of loss. The key has a 5 x 5 mm/0.2 x 0.2 inch square hole, and the overall dimensions are 26 x 24 mm. WIDE APPLICATION: Flintronic radiator valve keys fit most radiator heating systems, saving you time. This universal radiator key is compatible with both older and more modern radiators.