perforated hdg steel strut channel size 1.Professional manufacturer & exporter 2.CCC,CE,NEMA,UL,ISO9001 ... , 2mm, 2.5mm,2.75mm, 3mm 2. Standard length: 2440mm, 3000mm, 5800mm, 6000mm 3. Standard size: 41*21, 41*25, 41*41,41 ... systems.Certifications:Reference Project Involved: perforated hdg steel strut channel size