supply of installation and fixing, manufacturing, supply, installation and fixing made by supplier at jurisdiction of adra division of w / l & cee / faa ( in devnagari script ) marked whistle board, caution board, terminaiton board of sizes of irpwm. made out of 2mm thick aluminium alloy sheet conforming i.s.736 with back support of m.s.angle 25x25x3 mm. the entire face of the board shall be covered with yellow high intensity encapsulated retroreflective sheeting with hlva process. the letters shall be cut out of black high intensity encapsulated sheeting and provided on. the base sheet with hlva process. the board shall be fixed with m.s.angle of suitable size. [ warranty period: 30 months after the date of delivery ] => limited