supply of 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, 15 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: 5 54:1999 (rev. 4) , amend. no. 1 of oct. 2009 for screw. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]