SincereetaliSecurity LockThis sliding shutter for home and office, you can keep the window open or closed, avoiding the hidden danger of children and pets climbing the window. In addition, it prevents thieves. DURABLE MATERIALS: Stainless steel material, exquisite craftsmanship and superior quality. Our sliding window locks are sturdy, robust and stable, with beautiful workmanship and stainless steel frame for multiple uses. Quick Installation: Drill-free installation, card-type installation, no need to punch, easy to replace and maintain. No additional tools are required. Inside each window lock is an Allen key that fixes the rail with the control key. Wide Application High security sliding window lock, tool to instantly lock doors and windows without drilling or tools. Easy to disassemble and reuse. Suitable for most vertical or horizontal sliding doors and many sliding doors with track width (adjustable). Note Size: 68 x 31 x 16 mm. Before purchasing our security locks, please make sure that your window tracks do not exceed 16 mm in thickness. The height of the tracks does not exceed 19 mm. (Note: does not apply to the marker in the center of the window).