Corrosion resistant and high hardness: Our universal construction wrench is made of high quality zinc alloy. Thanks to the shiny nickel coating, the universal key is extremely durable. It has the ability to prevent corrosion and resists most acids and other corrosive agents. And after heat treatment and hardening treatment. Make it use longer. Clear Scale Easy Measurement: Handy scale behind a square key for measuring cylinder lengths from 25 to 75mm. 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 Wrench: Architect key with cylinder locking nose for PZ mortise lock, no profile cylinder in the outer housing structure. 3 square keys, sizes 6, 7 and 8 mm. to check the heating valves or open the ventilation grilles. Allen key: This universal architect wrench has a 3mm Allen key on the end and a short gear with a flat cam. For loosening or fixing door handles. Control cabinets and service shutters can also be opened effortlessly. Multifunctional construction key: The architect's key is a measuring rule with which the angle of the contour cylinder is measured. The key to a new building is the salvage tool, especially in hull construction. The construction key is the ideal helper as a control cabinet key or if no door handle has yet been installed. It can also be used as a bottle opener.