GI Pipe 1.Grade:SGCC DX51D DX53D DX54D, etc 2.Wall Thickness:2.0-4.5mm 3 ... JIS, etc Grade SGCC, DX51D, DX53D, DX54D, etc Wall Thickness 2.0-4.5mm Nominal Diameter (ND) 6 ... transport, machinery parts.It also used for threading pipe installation, connected by deformed bar. Payment Items L ... ,different kinds of pipes (like Seamless Steel Pipe ,Welded Steel Pipe ,Square/Rectangle Steel Tube etc.) ,Light/Heavy ...