As a trusted name in security for over 70 years, Kwikset embodies reliability, innovation, and style. The 600 series is the largest-selling deadbolt in America, providing strong, effective protection without breaking the bank. This single-cylinder deadbolt is operated via a key on the exterior and a thumb turn on the interior, ensuring convenience and security for your home. | Kwikset | | SmartKey Security Antique Brass Metal Single Cylinder Deadbolt | Best Buy