[Good Quality]: The lock core is made of brass, offering good hardness and toughness, enhanced anti-theft performance, and anti-drilling protection. The matte finish lock cylinder is durable and resistant to damage. [Easy Installation]: This lock cylinder can be quickly and easily installed using a screwdriver (cruciform head). The cylinder design helps prevent lock picking and tampering. The button-equipped cylinder includes an emergency and safety function, allowing locking from both sides for added convenience. [Security Key]: This lock cylinder comes with 2 A keys and 6 B keys. Inserting key B and turning it 360 degrees counterclockwise deactivates key A, providing added security after renovation or access changes. [Door Lock Cylinder Design]: Total length 90 mm. Features a double lock cylinder system with 8-pin elements, a reversible key system with horizontal key entry, and can be opened and locked from both sides using a key. [General Application]: Suitable for indoor and outdoor use, compatible with various door types including wooden, metal, and PVC doors. Ideal for replacement or new installations on entrance doors, bathroom doors, single or double doors, and sliding doors. Specification Material: Brass Lockable on both sides Length: 90 mm Package Includes 1 x Cylinder lock 6 x B keys 2 x A keys Note 1. Please allow 1-2 mm measurement deviation due to manual measurement. 2. Due to differences in monitor displays, the color in the image may slightly differ from the actual item.