supply of plastic cover , supply of plastic cover for 3 aspect signal unit cover opened from front side and bottom side and made of black polythene sheet of 100 micron thickness. size:- 1300mm x 460mm x 205mm. on back sid e 75mm wide corner to corner diagonal cross mark of silver of 100 micron thickness to be provided to the up cover with signal unit suitable to nylon rope of 5 mm dia and 4 mtr length to be provided on front side and of 1.5 mtr length at the centre. [ warranty period: 12 months after the date of delivery ] ] , supply of plastic cover for 4 aspect signal unit cover opened from front side and bottom side and made of black polythene sheet of 100 micron thickness. size:- 1700mm x 460mm x 205mm. on back sid e 75mm wide corner to corner diagonal cross mark of silver of 100 micron thickness to be provided to the up cover with signal unit suitable to nylon rope of 5 mm dia and 4 mtr length to be provided on front side and of 1.5 mtr length at the centre. [ warranty period: 12 months after the date of delivery ] ] , plastic cover for 2 aspect signal unit cover opened from front side and bottom side and made of black polythene sheet of 150 micron thickness. size:- 1200mm x 460mm x 205mm. on back side 75mm w ide corner to corner diagonal cross mark of aluminum color paint to be provided. to tie up cover with signal unit suitable nylon rope of 5mm dia and 4mtr length to be provided on front side and of 1.5 mtr length at ce nter [ warranty period: 12 months after the date of delivery ] ] , supply of plastic cover for 2 aspect signal unit cover opened from front side and bottom side and made of black polythene sheet of 100 micron thickness. size:- 1200mm x 460mm x 205mm. on back sid e 75mm wide corner to corner diagonal cross mark of silver of 100 micron thickness to be provided to the up cover with signal unit suitable to nylon rope of 5 mm dia and 4 mtr length to be provided on front side and of 1.5 mtr length at the centre. [ warranty period: 12 months after the date of delivery ] ]