For double leaf and central bridge windows, the 2520 abus additional window lock is the ideal solution. the structure is particularly narrow, making the fuse ideal for tight installation conditions. the large rotary latch locks automatically, the key is only needed to open. the double leaf lock is suitable for aluminium, wood or plastic windows. frame mounted only 2520, so window sashes are not punctured. you should fix the hinge edges separately. for double leaf windows made of aluminium, wood or plastic, with center bridge locking via pivoting latches, key opening narrow construction, ideal for tight installation conditions 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.