BLOCKPROFIL NL system is designed for production of the “Dutch” windows. These systems are recognized by application of the 120 mm window frames, that can be connected with different types of 70 mm wings (not obversed, semi obversed and obversed). Large size steel enforcement makes it possible to design large windows, which are compliant with static requirements. A very wide window frames, equipped with external fillisters make it possible to install windows in easy and flexible way in the buildings made of obverse bricks (clinkier) without any additional building work.