LH With Fixing Kit. The Borg Locks S505 is an aluminium latch designed for narrow door stile or aluminium doors. This 28mm backset ‘Ali’ latch will retrofit a BL5000 or BL5400 series lock and is suitable for internal and sheltered external use on wooden, composite, aluminium and steel doors. Available in a choice of left or right handed versions the latch is supplied handed, however, it can be reversed on site if necessary. Also there is an option as a complete kit which includes the latch and a fixing kit comprising of a an aluminium strike plate, fixing tabs, spindles and screws.. 28mm backset aluminium latch. Designed for narrow door stile or aluminium doors. Retrofit for BL5000 & BL5400 series. Supplied handed - but is reversible on site