Material: Our universal construction key is made of high quality zinc alloy. Thanks to the high-gloss nickel coating, the universal key is extra durable. Convenient ratio: Convenient scale behind a square hex key for measuring cylinder lengths of 22-75 mm Flashing key: Architect key with cylinder lock nose for PZ mortise lock, no profile cylinder in the outer housing structure Housing keys: 3 square keys, size 6, 7 and 8 mm. for checking heating valves or opening ventilation grilles. 100% Satisfied Service: Enjoy a smooth and worry-free return service within 1 month. If you have any questions, please do not hesitate to contact us., Weight: 0.2645547144 Pounds, Manufacturer: QWORK