galvanized steel UD channel used for gypsum drywall suspened ceiling, 27x28mm I'm Brank, export ... ISO9001, we apply the most strict quality control system, three steps inner inspection. We export monthly about ... 50mm, 63m, 70mm, 75mm, 92mm, 118mm, 138mm.FURRING SYSTEM 35x22mm, 35x16mm.WALL ANGLE 23mm, 25mm, 28mm, 32mm.CD ... & UD SYSTEM 60*27, 27* 28mm,many more size are ...