Stainless steel exhaust pipe/tube description: 1) Standard: JIS, AISI, ASTM, DIN 2) Outside diameter: 6mm to 127mm 3) Wall thickness: 0.4mm - 2.5mm 4) Material: 201,202,301,304,304L,321,316,316L,430 5) Surface: mirror polish, satin finish 6) Application: exhaust system 7) Perforated round hole 8) Packing:as customer's requirement. Every pipe in plastic bag.