隐藏式合页开启系统特点：
·最优化的型材截面，可以提供最大限度的通透空间，同时节省更多的材料；
·包括：全隐单侧开启、全隐双侧开启、执手单侧开启、安全锁单侧开启四大系列；
·五金件可以做到完全隐藏；
·高承重，大开启。

Features and advantages of Hidden opening system
·Thanks for the best solution with the profile design, to reach larger clearance of view,save more material from fabrication.
·Available with four series: inward or outward opening, inward and outward opening,inward or outward opening with handle operated, inward or outward opening with budget lock operated.
·All the gear could be hidden in the groove.
·High loading capacity and large element leaf can be reached.