Safety: the window handle can be used as a child lock/anti-theft device, by locking the window in the house, it offers more protection for the child and gives parents more safety, it is suitable for inward and outward opening plastics, aluminium and wooden windows as well as sloping windows.Installation size: this uses a 7 x 7 mm square with a locking pin length of 35 mm and a screw distance of 43 mm. These window handles are manufactured to industry standards so you can be sure this handle will fit almost all currently available Espag and Shoot Bolt systems.Easy installation: each window handle is equipped with 2 screws and 2 keys for easy installation, lockable when fits almost any window and is quick and easy to install in a few simple steps.Different opening methods: the window can be located with the handles in 3 conditions: closed, open, tilted. The handles can be locked with key when closed or tilted.Safety lock: the simple and safe operation provides additional security, the child-safe window handle lock provides more protection and safety in your home/home. Best suited for families with children and babies. One key can be used for all locks.