The bleeding key is suitable to drain or remove air blockage from the radiator. For easy movement in tight spaces, keys are clock shaped. for metal water tap and radiator usage. The structure is tight and can prevent , thus can safety when you use it. Features - Color: Silver. - Size: 3.00X2.00X0.60cm/1.18X0.79X0.24 inch. - Material: Zinc alloy. - Quantity per pack: You will receive 5 radiator keys, for replacing them, preventing the central heating system from breaking down during the winter months. - One size fits many radiators in the market, easy to use and brings convenience to your life. - These radiator keys are made of quality zinc alloy, light and practical, durable and sturdy, not easy to break, easy to hold and turn, even after screwing in a few rigid valves, there is still no distortion on the key. - Utility design: light and durable, the radiator wrench can save effort, good tool for every home, they are very sturdy and not easy to break or deform. - Wide applications: The radiator key is useful for bleeding air from radiators. Package list: 10 x bleeding keys