4 Pcs Left Door Opener--This must-have child safety device is designed to limit window opening to 100mm, prevent children or pets from falling or missing, ensuring their safety. /p> automatically re-engages the restricted position: it can be detached to facilitate fully opening the window, it automatically re-engages the restricted position upon closing the window, convenient to use. > < p>Durable 304 Stainless Steel: They are made of 304 stainless steel with excellent corrosion resistance, high strength and rust protection, prolonging its service life. Easy to use - just need a screwdriver to fix it to the window, complete the installation. (screws provided) Perfect Application: This reducer window is an ideal choice for home, preschool, security and more. Color: Silver Size: as shown Quantity Shipped: 4 pieces