Please Note: the square plate(not round) can not removed.You can use one key opening one set of deadbolts and entry lock,For keyed alike Sets, You can use one key opening 12 set of locks at most. Single Cylinder Deadbolt-For the deadbolt, it could be opened and locked by a key from outside and a thumb-turn button from insideand best used for your exterior and interior doors Same Keys for All Locksets- If you purchase a multi-set(12 sets at most, if you need more ones, contact with customer service), of a nickel door lock and a single cylinder deadbolt, they will all have the same keys. All of the deadbolts and locks will have the same key making it easy for you to keep a track Application-This combination of door lever and deadbolts, will give your home or rental house a new look, you can use them in contemporary/modern style roomtransitional traditional Victorian Colonialism home décor Steel Adjustable Latch-The door lever set fits doors with a thickness of 1-3/8