Solid Brass Door Lock Cylinder 90mm AntiTheft Lock Core with AB Key Control System

Solid brass antitheft lock core with AB key system designed to provide controlled access and reliable longterm performance. Key benefits Controlled access: A key is a decoration key intended for use by installers or decoration workers. B key is the master key. When the master B key is inserted, the A key is automatically disabled, providing secure master control. Improved security: The AB key arrangement allows property owners or managers to retain ultimate control while still permitting temporary access for authorized workers. Durable construction: Made from solid brass for corrosion resistance, strength, and long service life. Smooth operation: Precisionmachined components reduce wear and ensure consistent key action and locking performance. Features and specifications Product type: Antitheft lock core with AB key system. Keys: Two types, A and B. A serves as decoration key for temporary use. B serves as master key; insertion of B renders A inactive. Material: Solid brass lock core and key components for durability and reliable operation. Function: Provides controlled access and master override capability without changing external hardware. Practical applications Renovation projects: Allow decoration workers to access premises with the A key during work while retaining master control with the B key to secure the site when needed. Property management: Enable temporary access for contractors or cleaners while property managers keep master control to prevent unauthorized use. Office or shared spaces: Use for areas where controlled, timelimited access is required without replacing the entire locking mechanism. Usage notes Use this lock core as a replacement or upgrade when a controlled access AB key arrangement is needed. Ensure keys are stored and managed according to your access policies to maintain security. Soft notes Conversion: 1 cm = 10 mm = 0.39 inches. Color may vary slightly due to lighting and screen differences. Allow 0.5 to 2 cm difference due to manual measurement. This lock core provides a straightforward, mechanical method to separate temporary user access from master control while using a durable solid brass construction for dependable everyday use.