Durable construction This door lock is built with copper and stainless steel to deliver lasting strength and dependable performance. The combination of materials provides corrosion resistance and reliable operation over time, making it suitable for regular use in various environments. Enhanced security The lock features a robust antitheft solid mechanism that supports two control options: external key access and an internal rotary button for locking and unlocking. This dualaccess design enhances safety by allowing secure outside entry while enabling quick interior control. Easy installation The installation is straightforward and requires no special tools or expertise. Clear, simple steps allow most users to fit the lock quickly and with minimal effort, reducing downtime and enabling DIY or maintenanceled setup. Use scenarios Home entry door upgrade: Improve security for front or back doors with a dualaccess lock that combines external key control with inside rotary operation. Interior access control: Install on internal doors in a home or small office where easy inside locking and outside entry are both needed. Utility or storage areas: Secure utility rooms, closets, or workspaces that require reliable locking without complex installation or maintenance.