Most door locks use a spring bolt lock. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself.
A deadbolt is a locking mechanism that cannot be moved to the open position except by rotating the lock cylinder with the key. A deadbolt can therefore make a door more resistant to entry without the correct key.
A deadbolt is usually an effective security method, over and above a normal door lock. However, Prolock Security Locksmiths can also go a step further and install special plates in conjunction with your deadbolt. This will ensure that the deadbolt cannot be tampered with by a clever thief.