stop board of size 600mm diameter made out of 1mm thick gi sheet with hig h intensive prismatic retro reflective sheet and background red colour and lette rs in three languages english hindi telugu of colour white as per the railway st andards with minimum reflectivity distance of 250 mtrs with all necessary fixing cl amps bolts and nuts to suit for electric lifting barrier as per drg no s t mft 6077 a dv 1 or latest amendment warranty period 30 months after the date of delivery