- Made from durable, rust-proof zinc alloy, ensuring long-lasting performance and reliability. - Features clearly engraved laser scales on the surface, providing wear-resistant measurement accuracy. - Equipped with an auxiliary scale on the back of the square key, perfect for measuring cylinder lengths from 22 to 75 mm. - Designed with a strike plate compatible with lever cylinders, ideal for standard housing structures. - Includes three square keys in sizes 6 mm, 7 mm, and 8 mm, making it easy to check heating valves and open ventilation grilles. - The top end of the tool includes a 3mm Allen key and a short flat cam gear, facilitating the loosening or tightening of door handles. Applications: - Use the auxiliary scale to measure and adjust cylinder lengths in HVAC systems, ensuring proper fit and function. - The square keys are perfect for maintenance tasks, allowing quick access to heating valves and ventilation systems across various devices. - The integrated Allen key and cam gear provide versatility for door handle adjustments, enhancing user convenience. This tool is crafted for professionals and DIY enthusiasts looking for a reliable, multi-functional solution for maintenance and repair tasks.