As the industry leader, Kwikset has provided trusted security for over 70 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 piece on the inside. The Polished Brass finish adds to the traditional look and feel of the product and makes a classic statement. * For use on exterior doors where keyed entry and security is neededFeaturing SmartKey Security™, which protects against advanced break-in techniques and allows you to re-key your lock yourself in seconds.SmartKey Security™ re-key technology is compatible with Kwikset (KW1) keywayDeadbolt operated by key outside and thumb turn insideLatch has round corner faceplateANSI/BHMA grade 3 certifiedLatch has adjustable backset 2-3/8" to 2-3/4" to fit all standard door preparationsIncludes round deadbolt strike1 inch deadbolt throw