GALVANIZED STEEL STAY TUBE ( 25 mm ) TYPE- ERW AS PER RAILWAY ELECTRIFICATION DRG. NO.- RE/ 33/ P/ 2401 REV.- C OR LATEST AND RDSO ' S SPEC. NO.- ETI/ OHE/ 11 ( 5/ 89 ) Rev. 1 OR LATEST & ETI/ OHE/ 13 ( 4/ 84 ) With A & C Slip No 1, 2, 3 & 4 OR LATEST LENGTH OF TUBE 6 METER PLUS/ MINUS 10CM, MINIMUM AVERAGE MASS OF ZINC COATING 610 g/ m2 ( FOR LIGHTLY POLLUTED AREA )