supply of materials for various works necessary materials should be delivered within a radius of 50 meters from the location of each work , materials , quarry waste , stone aggregate ( single size ) :40 mm nominal size , stone aggregate ( single size ) :20 mm nominal size , stone aggregate ( single size ) : 10 mm nominal size , coarse sand - zone iii ( m-sand for concreting works ) , portland cement , hire charges of concrete mixer 0.25 to 0.40 cum with hopper , vibrator ( needle type 40 mm ) , laterite stone of size 35x20x20cm , solid blocks of size 30x20x15cm , solid blocks of size 30x20x20cm , fine sand ( zone iv ) , mild steel tubes hot finished welded , red oxide zinc chromate primer , welding by electric plant , flats up to 10 mm in thickness , mild steel round bar 12 mm dia and below , gi trafford profile sheet 0.35mm thick , bitumen washer 50 , stainless steel screws 50 mm , galvanised wire mesh of average width of aperture 1.4 and nominal dia. of wire 0.63 mm , wire nails , 100 mm channel shoulder 2.5 m long , double clip ( bridge clip ) , pvc pipe 63 mm outer dia . 6kgf / cm2 , pvc elbow 63 mm dia , pvc 45 degree elbow 63 mm dia , pvc door elbow 63 mm dia , pvc bend 63 mm dia , pvc tee 63x63x63 mm dia , pvc door tee 63 x63x63mm dia , pvc end cap 63 mm dia , pvc socket / coup ling 63 mm dia , twisted steel / deformed bars