The Avocet 2 Hooks & 2 Rollers Wide Yellow 35mm is a non handed lock which has 1535mm between the rollers. Locking points are engaged by lifting the lever of the double spindle nightlatch and changing of handing can be done by reversing the latch. This is the original Avocet 2 hook, 2 roller lock and features unique locking positions. Often known as the "yellow version" and shouldn't be confused with the silver AVO352H2RSS which has different locking positions. Latch reversal procedure depends on date of manufacture: either undo hexagonal screw on side of lock case to remove latch, reverse, reinsert and replace screw; or undo screw in centre of latch, reverse, reinsert and replace screw. Avocet locks were previously known as KMB or WMS. KMB and WMS multipoint locks have no markings on faceplate. The sash lifter version will not fit related keeps