Description This is a double security cylinder with a European profile, suitable for wooden, aluminum, and most PVCu doors. It features a high-precision mushroom pin and paracentric keyway for enhanced anti-pick protection. The cylinder is nickel-plated and measures 30mm in diameter and 55mm in length. It includes hardened steel anti-drill pins and springs, with eight anti-drill pins in each keyway for added security. The design allows the outside key to operate the lock even when an internal key is inserted, providing convenience for emergency access. Technical Specifications Size: 30mm diameter x 55mm length Material: Nickel-plated steel Anti-pick features: Mushroom pin, paracentric keyway Anti-drill protection: Hardened steel pins and springs with 8 anti-drill pins per keyway Compatibility and Accessories Suitable for wooden, aluminum, and PVCu doors Compatible with Euro profile lock systems Installation Measure the distance from the internal end of the cylinder to the center of