... China. Certified by ISO9001, we apply the most strict quality control system, three steps inner inspection. We export monthly about 150 x ... & STUD 41mm, 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 not listed ...