... friction stay connection for out-open window with greater safety for tall building.2.Profiles: aluminium alloy, 6063-T5, can ... and durable aluminum alloy . 2.fly screen material:fiberglass ,stainless steel ,nylon.3. with Fixed black fly screen mesh ... .Factory&WorkshopShowroomPackage&Loading Container Exterior bifold door with 1 sash or 2 sash Aluminum retractable insect screen,mosquito net,aluminum ...