... : Round Pipe, Square Pipe, Rectangular Pipe, Embossed Pipe, Threaded Pipe, Oval Pipe, Special-shaped Pipe, FittingFeature: 1) Round PipeOuter Diameter: 6mm ... , 21mm, 21.3mm, 22mm, 23mm, 24.2mm, 25mm, 25.4mm, 26.8mm, 29mm, 31.8mm, 32mm, 33.7mm, 32mm, 25mm, 35mm ... , Window, Balcony, Fence, Bench, Furniture, etc. Stainless Steel Slot Groove Oval Tube