Security: to prevent any break-in, this device locks the window when it is ajar and renews 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. Multi-function - 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 injury. 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 This product is designed to enhance the security of 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 and Rubber. Colour: black. Dimensions: approx. 6 x 4 x 3.5 cm. Package weight: approx. 78 g. 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 firmly fixed inside the sash. Turn the handwheel clockwise until the product is blocked. Mount the window frame at least 4 cm. Attention: 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 the colors may have chromatic imperfections due to the different positioning of the images.