it is solid and durable，good process, strong resistance, not easy to rust. he turning of the cylinder key is extra smooth, anti-pick, anti-drill, and anti-bump protection to give you peace of mind and . Smooth surface, bright color, and good anti-theft performance Versatile: Suitable for use with a wide range of doors including wooden, composite and doors. These door locks are suitable for all door types, including timber doors, metal doors, UPVC, patio door locks, French doors, and composite doors. They may be employed as replacement locks or where new installations are required.