Schlage® B Series deadbolts include the grade 1 B600, B700 and B800 models. The distinction between the three is the key cylinder included specified with the lock. B600 features the patent protected Everest 29 as the default keyway. B700 upgrades cylinder security to Primus® and the B800 offers a high-security UL-437 listed Primus® cylinder. But strength in the key system is only half the story. These tough yet beautiful deadbolts are built Schlage® strong, to be among the most durable in the industry. Their sleek, broadly angled trim ring in a shallow, 7/8 in. depth is offered in 10 finishes. With an impressive list of built-in security features and a wide variety of functions, the grade 1 B Series is Schlage®'s best deadbolt.