supply of fabricated and galvanized b series steel structures b-150 and b-175 with batten plates as per rdso drg. no. eti / c / 0071, rev-e or latest using fabricators own steel and zinc, steel confirming to is:2062:2011, gr-e 250 ( fe 410w ) quality a&is 808 / 1989 and zinc to is: 209 / 1992 and rdso spec no. eti / ohe / 13 ( 4 / 84 ) with a&c slip nos. 1, 2&3 for galvanization or latest. each b-150 mast of 9.5 mtrs length with approx. wt of 371.165 kg. mc 150mm x 75 mm shall be used. each b-175 mast of 9.5 mtrs length with approx. wt of 423.795 kg. mc 175mm x 75 mm shall be used. [ warranty period: 30 months after the date of delivery ]