T3-t8 extruded aluminum enclosure , anodizing thickness 8-12 micro Description: A lot of type, aluminum tube shape have triangle, circle, oval, square, rectangular, outside in the concave convex, within the cylindrical convex, triangle double cylindrical flat, concave, inner rib, u-shaped, eight, eight in plain surface concave, oval, square tubes, flat tubes, thin-walled, capillary, elbow, otherwise the bar (below 3.0), aluminum, etc.