Grade 2 security entry knob with SmartKey cylinder. SmartKey cylinder eliminates traditional pins and springs. Cylinder design 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. Has an adjustable backset 2 3/8". Knobs are keyed alike in multiples of 4.