1, the special steel cavity design,enhanced groove line and fixed line for the screw are esay for the hardware , more safe and reliable .
2, Seal block together with the main profile ensure the water outside can not go into the room.the grooves ensure the good dewatering, ;special glass bridges make the dewatering easiliy ,which also protect the glasses and brigde fastening on the original postion. 
3, Special design of Alu Rail and hardware grooves follows European standard make it easy to install the window 
4, The same bottle of each main profile make it easy to combine with other accessories.