Consumer clear pack packaging. Grade 2 security entry knob locking door knob with SmartKey cylinder. SmartKey function, cylinder design eliminates traditional pins and springs. New SmartKey cylinder provides instant re-key functionality. SmartKey cylinder is a bump-resistant, higher pick-resistant 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 1-3/8" up to 2". Standard adjustable backset 2-3/8" - 2-3/4". Requires 2-1/8 diameter lockset bore hole and a 1" diameter latch hole. Keyed alike in multiples of 4.