This spring loaded Mila restrictor is available in left hand and right hand version and the max window opening is 50mm and the catch auto engages the stud-plate upon closing.
LEFT
HANDED V...
For use where ventilation is required without having to leave the window wide open. Supplied with 4 fixing screws and 1 key. Suitable for timber windows. Fits Top Hung or Side Hung Window Frames. Univ...