Security Window Locks with Secure Screw Action

The only movable part is the screw, so if your encasement is wider than the gap (between the arms), then installation is impossible. I attempted to install these clamps onto (metal) windows, in 2 separate buildings, but failed.

This is a great product for securing windows that have window air conditoners or venting installed.

Used to secure sliding door while at work so I can keep room cool with air conditioning unit.