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