Windows locks are beneficial when securing a window fan or AC unit or opening the window "just a crack" for ventilation. The reason for this is that you can effectively lock the window in the precise position that prevents the window from opening any further, securing both your home and the ac unit.
Please note: As a rule, window screw locks are designed to work with sturdy metal frames. Using them on thin edges, such as a delicate vinyl track, may damage the structure or allow the window to slide with pressure.
Requires 28-36mm Clearance for Lock Screws.