Designed in Australia, the 001 Double Cylinder Deadlatch incorporates innovative safety features including Safety Release and LockAlert offering market-leading performance and reliability for your home. Features of the 001 Double Cylinder Deadlatch Available in Knob and Lever versions Conforms to the security and durability requirements of Australian Standard AS4145.2-2008 | SL7D8C6 Cut-resistant Stainless Steel Bolt 11 concealed anchorage points and a door frame strengthener that combine to offer high security protection Hold back function that allows you to use the door in passage mode Can be keyed alike to other Lockwood product