Technical specifications: Material: stainless steel. Dimensions: 68 x 31 x 16 mm. Colour: silver. < p>Quantity: 2 Double Window Stoppers Safety LocksThis sliding window stopper for home and office, you can keep the windows open or closed to prevent a hidden risk that children and pets climb the window. Also, it prevents burglars. Durable material: stainless steel materials, delicate craftsmanship and superior quality. Our sliding window locks are strong, solid and stable, beautiful workmanship, stainless steel frames that can be used many times. Quick Installation: No-drill installation, card type installation, no punching required, easy to change, repair. No additional tools are required. Inside each window lock is an allen key that holds the rail together with the control key. Wide ApplicationHigh security lock for sliding window, tool to instantly lock windows and doors, not need to drill 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 16 mm. Before purchasing our security locks, please make sure your window track thickness is no more than 16mm. The height of the rail is not more than 19 mm. (Note: not suitable for marks in the center of the window).