... : 0.1mm---3.8mm Items: Round Pipe, Square Pipe, Rectangular Pipe, Embossed Pipe, Threaded Pipe, Oval Pipe, Special-shaped Pipe, FittingFeature:1) Round PipeOuter Diameter: 6mm, 8mm, 9 ... : Handrail, Railing, Staircase, Door, Window, Balcony, Fence, Bench, Furniture, etc. Stainless Steel Heat Exchanger Tube