Easy to install: The window lock is highly self-adhesive and the non-marking sticker on the back of the security lock is suitable for secure installation on PVC, wood, composite windows and any other smooth surface, your window will be firmly fixed and can only be opened with the provided key . Standard size: The window lock cord which better fits the width of most windows and limits the distance the window can be opened, helping to reduce the risk of injury in the event of a fall. Child Safety Window: Child safety window blocks are made of High-quality materials with sturdy structure and smooth surface. The steel cable uses multiple strands of thin steel wire, which is not easy to break, and is wrapped with a plastic sleeve, which is rust-proof, wear-resistant and durable. Versatility: The sturdy refrigerator safety lock is versatile and suitable for refrigerators, cabinets, doors, windows, drawers, ovens, bathrooms, and more. Refrigerator door locks may stick to smooth surfaces such as tiles, glass surfaces, metal surfaces, plastic surfaces, etc. Material: Plastic+Steel Rope colour: Black Package Contents: 4 x safety lock with key Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.