Copper Construction: This is a practical lock cylinder featuring a single-opening design and solid copper construction, single open copper cylinder is sturdy and strong. Features anti-pick, anti-drill, and anti-bump protection to give you peace of mind and proper home security. Key for additional security and helps to them from being copied by unauthorised people who might have occassional access to your keys. Simple Installation and Usage: This door lock kit is easy to install and use,single open lock fits most door types. Simply the old lock cylinder, insert the new one, and secure it with the provided screws Use with a wide range of doors including timber, composite, UPVC, aluminium or patio doors with a Euro profile, Manufacturer: ZONSHJDKR