【Safety】The window handle can be used as a child lock/anti-theft device, by locking the window in the house, it provides more protection for the child and gives more security to the parents. It is suitable for inward and outward opening plastic, aluminum and wooden windows and sloping windows 【Installation Size】The distance between the screw holes of the handle is 43mm, the width of the main shaft is 7*7mm, and the length of the square shaft: 35mm; 【Easy Installation】Each window handle is equipped with 2 screws and 2 keys for easy installation, lockable to almost any window and installs quickly and easily in just a few simple steps 【Different Opening Methods】The window can be in 3 states with the handles: closed, open, tilted. The handles can be locked with a key when closed or tilted. 【Security Lock】Simple and safe operation provides additional security, the child-resistant window handle lock provides more protection and security in your apartment/house. Most suitable for families