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-sided deadbolt can be used along with a keyed knob or lever for added security, bolt is locked and unlocked by turn piece on inside of door. The complementary Antique Brass finish offers a warm feel with deep accents in the contours of the product. *