... anodized & powder coated color aluminium tubeSpecificationsRound(Square) Aluminum Tube: 1)ISO9001:2008 2)CNC machining 3)Good ... , Drilling, Punching, CNC machining, bending, etc 6,Shape: Square, Round, Flat, Oval, and according to customer's drawing. ... be required by customersSpecificationsround aluminum tube,used for sound box with high precision and large supply capability.Round Auminum Tube