Galvanized M. S. Tubes- Nominal bore 40mm, Medium class, ERW/ HFIW/ HFW- Quality and Random length 4 to 7 Mtrs. conforming to IS: 1239 ( Part 1 ) 2004. Screwed at both the ends as per IS: 554/ 1999, Socketed at one end & other end protected with Plastic thread Protector. Socket conforming to IS: 1239 ( Part 2 ) 2011. G. I Pipe shall be duly ISI marked as per statutory requirement.