supply of supply of plastic cover , supply of plastic cover 4 aspect signal unit cover operated from front side & bottom side ma de of black polythene sheet of 100 micron thickness size of 1700mm x 460mm x 205mm and back side 75 mm wide corner to corner diagonal to be provided total up cover with signal unit suitable nylon rope of 5m m dia and 4 meter length to the provided on front size and of 1.5 meter length at centre. [ warranty peri od: 30 months after the date of delivery ] ] , supply of plastic cover 3 aspect signal unit cover operated from front side & bottom side ma de of black polythene sheet of 100 micron thickness size of 1300mm x 460mm x 205mm and back side 75 mm wide corner to corner diagonal mark of silver colour of 100 micron thickness to be provided total up co ver with signal unit suitable nylon rope of 5mm dia and 4 meter length to the provided on front size and of 1.5 meter length at centre. [ warranty period: 30 months after the date of delivery ] ] , supply of plastic cover 2 aspect signal unit cover operated from front side & bottom side ma de of black polythene sheet of 100 micron thickness size of 1200mm x 460mm x 205mm and back side 75 mm wide corner to corner diagonal to be provided total up cover with signal unit suitable nylon rope of 5m m dia and 4 meter length to the provided on front size and of 1.5 meter length at centre. [ warranty peri od: 30 months after the date of delivery ] ]