Durable copper and stainless steel construction for lasting performance Built with copper and stainless steel to deliver strength, corrosion resistance, and dependable operation over time. Enhanced security with flexible access Features a robust anti theft solid lock that can be locked or unlocked using an external key or from an internal rotary button, providing safe and versatile control. Easy installation for everyone Straightforward installation process that does not require any special tools or expertise, enabling quick setup. Key benefits and performance Function: A reliable door lock that supports both external key access and internal rotary control for convenient use. Material: Copper and stainless steel for durability and long service life. Security: Solid construction and dual operation enhance safety for various settings. Maintenance: Minimal upkeep due to sturdy, corrosion resistant materials. 2 3 practical use scenarios Home entry or interior doors: Use where durable security and flexible access are valued for family members and trusted guests. Office or staff rooms: Secure workspaces while allowing quick access for authorized personnel with either a key or the internal button. Storage or utility areas: Protect equipment or supplies in closets and utility rooms with reliable, low maintenance locking. Notes Designed for standard door applications requiring a door lock with external key and internal rotary access. Installation is designed to be simple and tool for most users.