This maximum security latch is ideal for external timber doors. Approved by the Police Secured by Design initiative, these locks are recommended by insurance companies. Lock is externally key operated & internally locked via handle. Latch automatially deadlocks on closure of the door & uses a 6 pin high performance cylinger & a 20mm anti-carding bolt. Please Note: Available with either a 60mm or 40mm backset, depending on door size & available space.