supply of different materials for concrete boxculvert ( a ) construction of concrete box culvert on erathen road near house of shiben barman ( b ) construction of concrete box culvert on earthen road near house of kartik adhikary under suktabari gram panchayatwithin cooch behar- i dev. block -supply work under mgnega supply work under mgnega , rcc box culvert , portland cement , stone aggregate ( single size ) :20 mm nominal size , stone aggregate ( single size ) : 10 mm nominal size , carriage of stone aggregate below 40 mm nominal size , loading unloading & stacking sand / stone aggregate ( less than 40mm nominal size ) , coarse sand , g i wire , tor steel rods / hysd bars / tmt bars ( sail / tata / rinl ) ( fe415 / fe500 / fe500d conforms to is: 1786 ) , hire charges of shuttering plank ( 25mm-30mm thick ) without prop including all fittings , hire charges of shuttering plank ( 25mm-30mm thick ) with prop including all fittings , gst