supply of furniture ( high and low benches ) at 04 ( four ) numbers of institutions , supplying , fitting , fixing , etc . all complete including all incidental charges of student iron desk cum bench size shall be 1800 mm width x 895 mm depth x 750 mm height . table top & back shall be 18 mm ppb as per is 12823 & 2 . 0 mm thick pvc edge bending on all sides . under structure side frames & all vertical members are ms ewr sq tube of 25 . 4 x 1 . 2 thick . seat & desk bracket is made of 1 . 2 thick crca . complete side frame structure is wielded . tubes are closed with plastic caps . the shelf is 0 . 8 mm thick crca affixed below the desk with all side open . the complete under structure is knockdown and assembled using m5 taptite screws . finishing of the frame should be powder coated dft 50 ( +/- ) 10 micron .