The PAS3621 Yale Doormaster has croppable extensions that offer replacement for a wide range of multipoint locks with a maximum level of security. PAS3621 is the equivalent to BS3621 for mortice locks and is recommended by the NHBC, Risc Authority and DHF. 3 hook version Meets requirements of PAS3621:2011, Secured by Design and PAS24. Supplied with pre-assembled keeps using the patented uni-packer system for fast, easy and reliable installation. Operation: Latch reversal: Undo the screw in the latch to remove. Reverse, reinsert and replace screw. Nightlatch reversal: Automatically reverses.