supply of octagonal boom section-01octagonal boom section-01,octagonal boom section-01 as per drg no: rdso/s-11600 duly painted with holding brac ket welded and s.s. coupling for first joint with 16 nos. of nuts & bolts with spring washer out of which 8 nos. of nuts to be welded on inner side of smaller section of coupling plates at the hole positions. ad ditional 8 nos. of holes of 12mm dia.to be drilled on spot welded side of coupling plates and boom. par ty should submit nabl authorised lab certificate along with material. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]