These door locks are suitable for all door types including wooden, metal, patio door lock,composite doors. Cylinder features anti-pick, anti-drill, and anti-bump protection to give you peace of mind and proper home security. Smooth surface, bright color, and good anti-theft performance Unique anti snap features, also bump, drill and pick resistant. Anti-theft and anti-pry, resistant to forced entry and lock-picking, Grade C security protection, wear-resistant and durable, quiet operation indoors, suitable for replacing old lock cylinders, easy to install, multiple key configurations, rust-resistant, resistant to twisting and breaking, Manufacturer: WTGYxfdhDT