Corrosion resistant and high hardness: Our universal construction key 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 is resistant to most acids and other corrosive agents. And after heat treatment and hardening treatment. Make it use longer.Clear Scale andamp; Easy measurement: Convenient scale behind a square key 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 Wrench: Architect's key with cylinder lock nose for mortise lock, no profile cylinder in the outer structure of the case. 3 square keys, sizes 6, 7 and 8 mm. to check heating valves or open ventilation grilles.Allen Key: This universal architect key 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 flaps can also be opened effortlessly.Multi-functional building key: The architect's key is a measuring ruler 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 aid as a control cabinet key or if no door handle has yet been installed. It can also be used as a bottle opener. Have you found the right construction key? Still worried about not knowing how to measure the angle of the contour cylinder? With ergonomic technology Our construction key is based on ergonomic know-how. So you can easily measure the angle of the contour cylinder. If you use it for a long time, your hands will not be tired. It is comfortable to use and feels great. Durable and corrosion resistant The architect key is made of zinc alloy. The surface is coated with nickel which can resist corrosion. Good quality, sturdy and durable. It is a high quality tool for any construction site. Convenient design To be able to measure the required lock cylinder size. We have defined the practical scale of the construction key between 25 and 75 mm. Square chucks have angular lengths of 6, 7 and 8 mm. A measuring ruler with which you can better measure the angle of the contour cylinder. Note: If you use it at home, please keep it away from children. Avoid accidentally hurting children. Specification: Color: silver Package includes: 1 * Architect Key