Robust material: These radiator and valve lock keys are made of quality zinc alloy, high quality brass finished plating, sturdy and durable, firm connection, prevent water leaking. Anti-corrosion and practical, durable and sturdy, not easy to break, easy to hold and turn, even after screwing in a few hard valves, there is still no deformation on the key Precision plating: Strong radiator bleeder key and lock valve keys are precision multi-layer plating, acid and water resistant, stay clean in humid environment for a long time. The structure is tight and can prevent the explosion, so can guarantee the safety when you use it Convenient set: argos radiator key easy to install and carry, indoor and outdoor, both can be used. This square water faucet wrench set includes most styles of radiator, faucet and cabinet wrenches, plug applications, it is a practical set and must-have items to meet your daily demands Note : The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.