Security: to prevent break-ins, this device allows you to lock the window when it is ajar and to renew the air inside. Appearance: professional surface treatment, solid, compact and aesthetic. Using high quality materials, easy to open, suitable for most plastic, steel and alloy windows. Multifunction - These locks work well on most wood, glass, plastic and metal surfaces. You can secure your sliding doors, porch, closet, shower, storage room and entertainment center, as well as your sliding windows. Your child will be able to explore without getting hurt. Premium Quality: Our sliding door lock is made of durable metal reinforced with rubber. Our sliding door locks limit and lock the opening of sliding doors and windows so your child stays safe inside. Product Description: Description: This product is designed to add security to horizontal sliding windows. Adjust your window locking system so that opening is safe and secure against theft. Use to keep windows closed and partially open. Adjustable length with handwheel, for easy use. Features: - Material: Metal + Rubber. Black color. Dimensions: approximately 6 x 4 x 2.4 cm. Package contents: 2 locks for doors and windows. Instructions: Lock the window before installing this product. Insert the rod of this product into a groove so that it is securely fixed inside the sash. Turn the handwheel clockwise until the product is blocked. Mount the window frame at least 4 cm. Warning: 1. Since measurements are taken by hand, the sizes indicated may vary by 1-2 cm. Please only order if you accept this margin of error. 2. Please also note that colors may have chromatic imperfections due to different positioning of images.