①. 2-piece aluminum lockable window handle Universal key 35 mm balcony door handle with 360 lock gray. Suitable for all common windows and balcony doors. Safety: The window handle can be used as a child lock / anti-theft device, providing more protection for children and greater security for parents when locking the windows in their home. Plastic, aluminum and wooden windows, inward and outward opening, as well as tilting windows. ②. Installation dimensions: The distance between the screw holes of the handle is 43 mm, the width of the main shaft is 7 * 7 mm, and the length of the square shaft is 35 mm; These window handles are made according to industry standard dimensions, so you can be sure that this handle will fit most current Espag and Shoot-Bolt systems. ③. Easy to install: Each window handle comes with 2 screws and 2 keys, easy to install, locks to almost any window and can be installed quickly and easily in just a few simple steps. ④. Various opening methods: with the handle, the window can be in 3 states: closed, open, tilted. The handle can be locked with a key when it is closed or tilted. ⑤. Safe lock: simple and safe operation provides additional security, and child-resistant window handle locks provide more protection and security for your apartment/house. Best suited for families with children and babies. One key can be used for all locks.