The Viro Panzer locks are a true security lock that are great for doors, gates and shutters. They are designed to work with our Pewag square security chain for maximum security. A unique design does not allow for any tools to get a grip to cut or open the lock. This lock is supplied with 3 Viro top security profile nickel-plated brass keys. If you are looking for a complete setup with our matching Pewag square security chain, check out our security chain packages.