bids are invited for supply of lightning conductor system , prefabricated gel earthing electrode , gi pipe 100 mm dia medium grade , back fill compoun , ms earth pit cover of size 30 cm x 30 cm , aluminium strip 25 x3 mm x 9m , iron spikes 16 inch long , gi strip 32 x 6mm of length 3m , gi nipple 20 mm dia and 10 cm long , gi reducer socket 40 x20mm , lightning air terminal a copper tube 150 cm long x 25 mm dia , ms cl 25 x 3mm with nut and bolt , gi wire 12 gauge , earth augur , pvc pipe 3m long 6 inch dia , user manual , tester set meger , gi pipe medium grade of 40mm dia 9 mtr long , natural sand , aggregate 20mm , gi pipe 40 mm bore 9m long , 50 mm bore gi pipe sleeve , crystaline conductive mixture total quantity : 517