SafetyThe 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 sloped windows. Installation SizeThe distance between the screw holes of the handle is 43 mm, the main shaft width is 7*7mm, and the square shaft length: 35mm; These window handles are manufactured to industry standard dimensions, so you can rest assured that this handle will fit most Espag and Shoot-Bolt systems currently available. 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 MethodsThe window can be in 3 states with the handles: closed, open, tilted. The handles can be locked with a key when closed or tilted. Safety LockSimple and safe operation provides extra security, child-proof window handle lock provides more protection and security in your apartment/house. Most suitable for families with children and babies. One key can be used for all locks.