The Universal Yale Doormaster lock replaces 100% of 35mm and 45mm backset multipoint locks with 92mm centres on the market. Supplied as a 1 piece lock with 1 piece pre-assembled keep and patented uni-packer system for fast, easy and reliable installation. 1 Piece lock, full length keep and uni-packer system. Fixing screws pack. Operation: split spindle or lift lever. Latch reversal: Undo the screw in the latch to remove. Reverse, reinsert and replace screw. Nightlatch reversal: Automatically reverses.