Grade 1 security single cylinder deadbolt with Smart Key cylinder. Cylinder design eliminates traditional pins and springs. Cylinder provides instant re-key functionality. Smart Key cylinder is a bump-resistant, higher pick-resistance lock. Included with each lock is the re-keying learning tool that allows the lock to be re-keyed in 3 easy steps. Fits all standard doors 1-3/4″. Standard adjustable backset 2-3/8″ – 2-3/4″. Requires 2-1/8″ diameter crossbore hole and a 1″ diameter edge bore.