Precision bright tube is a kind of high-precision steel tube material processed by ordinary seamless steel tube (or reduced-diameter welded steel tube) through fine drawing or cold rolling. Because the inner and outer walls of the precision bright tube have no oxide layer, withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening and no cracks, it is mainly used to produce pneumatic or hydraulic components, such as cylinders. Or the oil cylinder, which can be a seamless tube or a welded tube.