This is a heavy-duty extruded aluminum lock with tamper-resistant single hex security screw and wrench for use on metal horizontal sliding windows. Securely locks window in closed or ventilating position and helps prevent accidental opening of window by child. It will fit on any track 1/4 in. or smaller. These locks come in a milled aluminum finish and are available in other colors.Exercise caution and do not over tighten these locks and cause damage on your window track.