The 2 hook, 2 roller lock offers both security and weather sealing in a quick to fit, croppable lock. Designed to replace most multi point locks in the UPVC UK market. Comes with :3 piece lock and keep set, fixing screws pack and a set of packers. Fits a conventional 16mm wide Euro groove, with 35mm backset. It uses adjustable rollers for enhanced performance and weather sealing and twin high security hooks for anti-separation resistance; with adjustable keep plates. Lift lever or split spindle nightlatch operation. Latch reversal: Undo the screw in the latch to remove. Reverse, reinsert and replace screw. Nightlatch reversal: Remove latch to reveal a small screw. Use a small bladed screw driver to turn the screw 180 degrees.