tender for manufacture and supply of trestle for lhb coaches as per drawing no wr/ml-352/cmanufactured by msc class heavy duty erw pipe confirms to is:1239 part 1-2 32mm thick ms plate proposedfor top plate confirms to is 2062-99 for rib and base plate ms plate 10mm thick proposed and confirms to is2062-99 solid wooden block size 390*390mm (drawing attached) .