... .0-1.5mm;Length:6m 3.Usage:Auto Exhaust,Auto Muffler,Heat Exchanger exhaust pipe for generator 1. Outside Diameter: 12-90mm Wall Thickness ... : GB,ASTM,JIS3. Usage: Auto Exhaust,Auto Muffler,Heat Exchanger ect Production range of 409L pipe for auto silencer / car exhaustOutside Diameter(MM ... .5761.01.21.5821.01.21.5901.01.21.5 exhaust pipe for generator