Step up to designer styles and superior security with Kwikset signature series products. The largest-selling deadbolt in America, the 600 series provides tough, effective protection at an affordable price. The complementary Antique Brass finish offers a warm feel with deep accents in the contours of the product. This double cylinder deadbolt is operated by a key on both sides. Smart Key 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. Its time to re-key. Smart Key provides the highest level of residential security and features Bump Guard to protect against lock bumping.