supply of plastic cover for 2 aspectplastic cover for 2 aspect,plastic cover for 2 aspect signal unit cover opened from front side and bottom side & made of black polythene sheet of 100 micron thickness size: 1200mm x 460mm x 205mm. on backside 75mm wide corner to corner diagonal cross mark of silver colour of 100 micron thickness to be provided. tie up cover w ith signal unit suitable nylon rope of 5mm dia and 4 meter length to be provided on front side & of 1.5 mtr l ength at center. [ warranty period: 30 months after the date of delivery ] ] , plastic cover for 4 aspect signal unit cover opened from front side and bottom side & made of black polythene sheet of 100 micron thickness size: 1700mm x 460mm x 205mm. on backside 75mm wide corner to corner diagonal cross mark of silver colour of 100 micron thickness to be provided. tie up cover w ith signal unit suitable nylon rope of 5mm dia and 4 meter length to be provided on front side & of 1.5 mtr l ength at center. [ warranty period: 30 months after the date of delivery ] ] , plastic cover for 3 aspect signal unit cover opened from front side and bottom side & made of black polythene sheet of 100 micron thickness size: 1300mm x 460mm x 205mm. on backside 75mm wide corner to corner diagonal cross mark of silver colour of 100 micron thickness to be provided. tie up cover w ith signal unit suitable nylon rope of 5mm dia and 4 meter length to be provided on front side & of 1.5 mtr l ength at center. [ warranty period: 30 months after the date of delivery ] ] => limited