Em-D-Kay (Like Segal 466, SE 14325) Solid Bronze Jimmy Proof Automatic Deadlocking Slam Lock Interlocking Deadbolt Premium Security Series Single Cylinder Lock Set design locks automatically when door is closed, but can be set to inactive; Bronze (US10). Surface mounted; cross bolt locking feature resists forced entry and mounts to wood or metal doors and frames. Includes an Automatic Relocking Angle Strike. Hold-Back feature - allows user to keep door unlocked or to disable exterior key operation. Jimmy-Proof automatic locking - concept prohibits entry by spreading the door frame, and conveniently relocks the door upon closing. Shutter-Guard - prohibits tampering with the lock if the outer cylinder is compromised. Internal High Strength Carbon Steel components - provide high security and reliable operation. Solid High Strength Bronze Alloy - for the ultimate security and durability. Em-D-Kay (Like Segal 466, SE 14325) Single Cylinder Slam Lock Consists of: Polished Brass Solid Rim Cylinder, Automatic Relocking Angle Strike, SE1 keyway, screw pack, mounting plate and instructions, Boxed.