As the industry leader, Kwikset has provided trusted security for over 60 years and has become synonymous with security, peace of mind, style and innovation. The largest-selling deadbolt in America, the 600 series provides tough, effective protection at an affordable price. This single cylinder deadbolt can be locked or unlocked by a key on the outside, or the turn button on the inside. SmartKey Re-key Technology allows you to control who has access to your home. Re-key the lock yourself in seconds in 3 easy steps. Have you recently moved or had a child lose a key? It’s time to re-key. SmartKey provides the highest level of residential security and features BumpGuard to protect against lock bumping. The Venetian Bronze finish is hand-rubbed to reveal unique bronze highlights and provides a rich and warm complement to the product's style.