supply of galvanized steel pipes & tubes isi marked in random length of 4 to 7 meters,galvanized steel pipes & tubes isi marked in random length of 4 to 7 meters,,galvanized steel pipes & tubes isi marked in random length of 4 to 7 meters, screwed a t both ends, socketed at one end and other end screwed protected with plastic protector, nominal bor e dia. 15 mm, medium class. sockets shall also be isi mark. material and specification : is: 1239 (pt. 1 ): 2004 (rev. 6), amend. no. 6 of june 2021 for tube; is: 1239 (pt. 2): 2011 (rev. 5), amend. no. 3 of march 2016 for socket; and is: 554:1999 (rev. 4) , amend. no. 1 of oct. 2009 for screw. [ warranty period: 30 months after the date of delivery ] ]