supply of stop board of size 600mm diameter made out of 1mm thick gi sheetstop board of size 600mm diameter made out of 1mm thick gi sheet,stop board of size 600mm diameter made out of 1mm thick gi sheet withhig h intensive prismatic retro reflective sheet and background red colour andlette rs in three languages english, hindi & telugu of colour white as per therailway sta ndards with minimum reflectivity distance of 250 mtrs with all necessaryfixing clam ps, bolts and nuts to suit for electric lifting barrier as per drg.no. s&t/mft/6077.adv .1 or latest ammendment as per drg.no. of size 600mm diameter made out of 1mm thick gi s spe cn: of size 600mm diameter made out of 1mm thick gi sheet withhigh intensive prismati c retro reflective [ warranty period: 30 months after the date of delivery ]