Designed in Australia, the Paradigm 005 Double Cylinder Deadbolt represents the pinnacle in deadbolt security products. Incorporating innovative safety features including Safety Release, Lock - Alert and Dual - Select, the 005 Double Cylinder Deadbolt is ideal for residential and architectural applications.LockAlert indicates the mode (Secure, Safety or Passage) the lock is inDualSelect allows the key to turn from outside to throw the lock into either Safety mode or further into Secure mode - Suits door thickness 23mm to 48mm. Spacer ring (included) required for door thickness 32mm to 36mm - Conforms to the security and durability requirements of Australian Standard AS4145.2-2008, SL8D8C6K5Multi-mode slimline deadbolt providing safety, security and convenience