* Designed to limit opening of a window to 100mm, prevent children or pets from falling or running out, ensure their safety. * It can be released to facilitate full opening of the window. It automatically re-engages restricted position on closing of the window, convenient for our use. * Material: Made of 304 stainless steel with great corrosion resistance, high toughness and rust protection, extend its service life. * Easy Installation: Just need a screwdriver to fix the restrictor locks to the window, complete the installation (Come with Screws and Operation Manual) * It Is more convenient to have Right Handed and Left Handed items in the pack. Ideal for home, kindergarten, school safety and more. Material 304 Stainless Steel Colour .