Safety LocksThis sliding window blocker for home and office, you can keep windows open or closed to avoid a hidden risk of children and pets climbing the window. In addition, it prevents burglars. Durable material: stainless steel materials, delicate craftsmanship and premium quality. Our sliding window locks are strong, sturdy and stable, fine workmanship, stainless steel frames that can be used many times. Quick installation: punch-free installation, card type installation, no punching required, easy to change, repair. No additional tools are needed. In each window lock there is an Allen key which holds the rail with the control key. Wide ApplicationHigh security sliding window lock, tool to instantly lock windows and doors, no need for drilling or tools. Easy to remove and reusable. Suitable for most vertical or horizontal sliding doors and many track width (adjustable) sliding doors. NoteSize: 68 x 31 x 16mm. Before purchasing our security locks, please make sure that the thickness of your window track does not exceed 16mm. The height of the rail is not more than 19 mm. (Note: Not suitable for markings in the center of the window).