supplying materials for composit pit construction in maruthonkara gp , solid blocks of size 30x20x15cm , portland cement , coarse sand (zone iii) , g.i pipes 50 mm dia , g.i. pipes 40 mm dia , red oxide zinc chromate primer , welding by electric plant , gi trafford profile sheet 0.35mm thick , bitumen washer , g.i limpet washer , galvanised steel j or l hooks 8 mm dia , galvanised steel bolts & nuts 6 mm dia and 25 mm long round head with slots , stone aggregate(single size):20 mm nominal size , stone aggregate(single size): 10 mm nominal size , hire charges of concrete mixer 0.25 to 0.40 cum with hopper , vibrator (needle type 40 mm) , fine sand (zone iv)