MAGNETIC DOOR CONTACT These locks are said to be "fail-safe," meaning that once the power goes out, the door will remain unlocked, allowing occupants to exit safely. One of the biggest advantages to using this is that it can't be picked or tampered with like a traditional lock cylinder. No keys are used, as the lock is generally tied into an electrical security system. Features Features Special Aluminum, Firm and Durable Special Design, Suitable for Frameless Glass Door The best choice of Access Control