stainless steel perforated pipe for exhaust system 1.OD:8-101mm 2.WT:0 ... 4.Best quality stainless steel perforated pipe for exhaust system 1.O.D of welded steel pipe:1/ ... welded steel pipe stainless steel perforated pipe for exhaust system 1.Outer Diameter of welded steel pipe:1/ ... with quality service. CommodityWelded steel pipe(welded steel tube)StandardsGB,ASTM,JIS,BS,DINGrade Q195,Q235,Q345,10 ...