... sand blasting, polishing, powder coating, electrophoresis, clear anodized, a variety of bronze anodized shades and black, silver, golden, ... as you want1 Diameter: From a circular micro-tube with a diameter of 3mm to a 500mm great tube.2 Section: circle, square ... sand blasting, polishing, powder coating, electrophoresis, clear anodized, a variety of bronze anodized shades and black, silver, golden, ...