The inside & outside of the windows glass clip are designed in cambered, it looks attractive and gliding and has a strong visual effect.

The duck-month is designed into the connecting of window’s sashes and frame, that makes it has two isotonic entrails in the inside and outside. The capability of airproof and waterproof reaches grade 5 of the government standard.

The design of rabbed adopts the European standard and it connects with active corners, the accessories is very simple that it can saves material and manual work, and nice-looking of the corner. It is easy to assemble that makes it convient for the mass production.