Kwikset Security 600 Deadbolt Series Polished Brass Single Cylinder DeadboltAs 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 is operated by a key on the outside or a thumb turn on the inside. The Polished Brass finish adds to the traditional look and feel of the product and