... rack2) Material:Staniless steel composite pipe(Exteral Layer,stainless steel 201/304,internal layer:carbon steel Q195~Q235),it does not rust ... :diameter 25.4mm,Thickness(1.2mm,1.5mm,1.8mm,2.1mm).4) Thickness tolerance of steel pipe:±0.1mm,Length ... LiFan,JianShe,Xinyuan,ZongShen,Longxin,Suzuki,DaYun,and etc. rear rack(motoycycle parts manufacturer)