Protect your home and valuables from intruders by installing the Kwikset 660 5 Single Cylinder Deadbolt w/ Smart Key Technology. This single cylinder deadbolt provides tough, effective protection, offering Ansi/bhma Grade 3 security. The set includes an adjustable latch and deadbolt that fits all standard door preparations, and can be combined with a keyed knob or lever for additional security. The deadbolt also features patented bump guard technology and superior pick resistance. Plus, in the case you should ever lose a key, you can instantly re-key your own lock in seconds thanks to Smart Key Re-Key Technology.