supply of plastic cover for route signal unitplastic cover for route signal unit,plastic cover for route signal unit opening form front side bottom side. x mark to be painted with white colour covering the entire back side. (139 unit and 302 for arm total - 441 nos) , supply of plastic cover of 2 aspect signal unit cover operated from front side & bottom side made of black polythene sheet of 100 micron thickness size of 1200mm x 460mm x 205mm and back side 75mm wid e corner to corner diagonal to be provided total up cover with signal unit suitable nylon rope of 5mm dia and 4 met er length to be provided on front size and of 1.5 meter length at centre. accepted make/brand - self (war ranty period: upto 30 months from the date of supply)