Disc Tumbler Locks Operation Disassembly Keying Security Cam Locks Reading Disc Tumbler Locks Double-Bitted Disc Tumbler Locks 87 88 89 89 89 89 90 99 Chapter 7. Pin Tumbler Locks Construction Disassembly Assembly Choosing a Pin ...... Security Engineering, the leader and major proponent of electromagnetic locks, lists these major features: â– A high holding (1500 pounds). Effectively seals the door from both sides, keeping intruders out and/or valuables safely in. ...