【Corrosion Resistant & High Hardness】: Our universal construction wrench is made of high quality zinc alloy. Thanks to the bright nickel coating, the universal wrench is extremely durable. It has the ability to prevent corrosion and is resistant to most acids and other corrosive agents. And after heat treatment and hardening treatment. Make it use longer. 【Clear Scale Easy Measurement】: Convenient scale behind a square wrench for measuring cylinder lengths from 25 to 75 mm. Laser engraved. The scale is accurate, the writing is clear and it is not easy to wear. Which effectively prevents corrosion and provides accurate measurement for your long-term use. 【Square Chuck Key】: Architect wrench with cylinder locking nose for mortise lock, no profile cylinder in the outer structure of the housing. 3 square keys, sizes 6, 7 and 8 mm. For checking heating valves or opening ventilation grilles. 【Allen Key】: This universal architect's key has a 3 mm Allen key at the end and a short gear with a flat cam. For loosening or fixing door handles. Switch cabinets and service flaps can also be opened effortlessly. 【Multifunctional Construction Key】: The architect's key is a measuring ruler with which the angle of the contour cylinder is measured. The key for a new building is the lifesaver, especially in hull construction. The construction key is the ideal aid as a switch cabinet key or if no door handles have yet been installed. It can also be used as a bottle opener. Quantity delivered: 1 piece