supply of galvanized steel pipes & tubes isi marked in length of 6 meters.galvanized steel pipes & tubes isi marked in length of 6 meters.,galvanized steel pipes & tubes isi marked in length of 6 meters, screwed at both ends, s ocketed at one end and other end screwed protected with plastic protector, 25 mm nb, 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 dat e of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]