Safety LocksThis sliding window blocker for home and office, you can keep the windows open or closed to avoid a hidden risk of children and pets climbing the window. Besides, 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 16mm. 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). Technical specifications: Material: stainless steel . Dimensions: 68 x 31 x 16 mm. Colour: silver. < /p> Quantity: 2 double window plugs Functions: - To prevent children from open the window and accidentally fall. Safety device to stop children's dangerous fingers. - Keep the air fresh and ventilated. - Ideal for use in private homes, dormitories, hospitals, schools, universities and offices. Notes: 1. Since measurements are taken by hand, the sizes indicated may vary by 1-3 cm. Please make sure you do not mind before purchasing. 2. The color of the actual item may vary from the pictures, depending on your computer's display and brightness settings. Please take the actual object as the standard. Thanks! 3. Our products can be returned unconditionally. If you have any questions, do not hesitate to contact us. We are 24 hours for you. 4. Please note that you have measured the wheel size before purchasing.