The Deadbolt Lock (Round, Round Cylinder) is a simple door lock consisting of a round base plate and a similarly round upper plate holding the standard round cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key and is separate from the lock mechanism. The lock mechanism typically has a cylindrical shape and contains a mechanism that connects to the bolt. The lock is engaged by extending the bolt into a receptacle on the door frame making it more secure and harder to defeat by picking or drilling than other types of locks.