Lockwood 3572 Primary Mortice LockPassed and compliance with AS1905. 1 fire door tests and requirements. This primary mortice lock is ideal for use on apartment entry fire doors, with thicknesses of 32 50mm and a 3 5mm clearance. It's easily customizable for functions like escape and lockable on either side, and comes with a 60mm backset. 89 and 127mm extended backsets are available on request. This product is rated S3 for security and D3 for durability, in accordance with AS4145. 2