... : 2) Material: 202, 304, 304L, 316, 316L and so on. 3) Size: OD 3mm-32mm Bright Anneal Steel Tube:1 ... under the high pressure, antirust oiling outside surface, plastic capping on both ends.8)Main Features:high accuracy, excellent brightness, no oxidization ... hydraulic system, automobile and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required ...