Metal accessories synchronous system with multi-core, 3D hinge keeps the door sealed, collapsible multi-dimensional.
HPTwindow use metal accessories by leading German companies such as ROTO, GU, GQ HPT. Brass fittings systems with multi-core, 3D hinges, specialized keys for the doors of HPTwindow not only aesthetic but also to ensure the safety and accuracy in use, to overcome disadvantages of the common metal accessories.
There are many different kits used for the open type: Open spin in, open out, granulation, open back-flip, slide open.