supply of materials for construction of concrete road pukuria upper pry school to timir mahata in chandabila gram panchayat , river bed material , loading unloading & stacking sand / stone aggregate ( less than 40mm nominal size ) , polythene sheet ( 150 gm per sqm ) , stone aggregate ( single size ) : 10 mm nominal size , stone aggregate ( single size ) :20 mm nominal size , portland cement , coarse sand , hire charges of shuttering plank ( 25mm30mm thick ) without prop including all fittings , thermocol 12 . 5 mm thick . , hire charges of concrete mixer 0 . 25 to 0 . 40 cum with hopper , hire charges of diesel road roller- 8 to 10 tonne , fine sand , display board , gst