The grade 1 security Kwikset Juno Combo Set contains :1 Juno entry knob and 1 SmartKey single cylinder deadbolt keyed alike. SmartKey cylinder eliminates traditional pins and springs. SmartKey cylinder provides instant re-key functionality. SmartKey cylinder is 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. Combo sets are keyed alike in multiples of 4.