ERW Pipes Idler Tubes Confirming To IS 92951983 Tolerances:OvalityBelow 168.3 0.5mmIncluding 168.3mm & above 1.0mm Eccentricity 5% Max MassI) Single Tube +_10%II) Per Load of 10 M.T +_ 7.5% Outside Diameter +_0.8%Thickness +_10%Straightness 11000 of anylength lengthI)Random 4 to 7 Mtr.II)Exact (+)6mm ( - )0mm