Character: Three chambers are designed in main profile. The slide track is design into tearing structure with groove, which is convenient to decide whether using Aluminum track. Also,client can not use the aluminum track, and using the flat wheel to match for flat groove. Independent drainage chamber and deep rainwater groove are suitable to rainy country or area. Also you can take the different glass bead to suitable for different thickness of glass. what is more, the slide system can save more space of living-house, standardized groove can match standard hardware and accessories.