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. The Polished Brass finish adds to the traditional look and feel of the product and makes a classic statement. This single cylinder deadbolt can be locked or unlocked by a key on the outside, or the turn button on the inside. SmartKey Security 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 Security provides the highest level of residential security and features BumpGuard to protect against lock bumping.