Feature: High security lock sliding window tool Instantly lock sliding windows and doors - no drilling or tools needed Place on window or door track & tighten thumb screw; lock shut or allow partial opening Prevents window from being forced or pried open from outside; easy removal and reusable Fits most vertical or horizontal sliding windows & many sliding doors to 2.5-4cm(Approx 1''-1.57'') track-rim width(Adjustable)