supply of octagonal boom section-02 , octagonal boom section-02 as per drg no: rdso/s-11600 duly painted with s.s. couplin g for second joint with 16 nos. of nuts & bolts with spring washer out of which 8 nos. of nuts to be wel ded on inner side of smaller section of coupling plates at the hole positions. additional 8 nos. of holes o f 12mm dia.to be drilled on spot welded side of coupling plates and boom. party should submit nabl a uthorised 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 ] ]