The Brüder Mannesmann security window handles fit almost any window and can be mounted quickly and easily. Also, they suitable for balcony and patio doors. These 4 window cranks are lockable when the window is closed and in tilt position. The closed handle prevents break-ins, and at the same time protect your children against unintentional opening of the windows/doors. Delivery includes 4 window handles, each with 2 screws and 2 keys per handle.