Practical installation without drilling the window sash: the 2510' abus additional window lock has a swivel latch and is thus only mounted on the window frame. zoom in close, the latch just slides to the window belt; key is required to turn on backup. the snap lock can be used on the handle side of single leaf windows made of aluminium, wood or plastic. you have to fix the hinge side separately. installation on window frame only, no puncture of the window belt windows and window doors for aluminium, wood or plastic windows open inwards by means of swivel latches, open with a key one key for several locks at the same time two keys included. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.