Tubular dead bolts and rim locks

摘要

Doorknob assemblies for exterior doors include a lock that provides a minimal amount of protection against unauthorized entry. This lock will prevent a lazy thief from entering a home, but a more determined intruder will find that it's not much of a deterrent. As a result, add-on door locks are standard for homes in all types of neighborhoods. Although locks operated by a number pad are becoming more common, traditional keyed locks still dominate the market. When shopping for a lock, be sure to check its ANSI rating. After undergoing operational and security tests, locks are graded 1 to 3, with 1 being the most secure. Most locks at home centers are graded 2 and 3, so if you want the best protection, you may need to look elsewhere.