First, the definition of wire rods Line bar (also known as plastic tube), outer coating layer for intermediate metal plastic composite pipe rust layer, between the metal layer and the plastic layer of environmental protection without the use of adhesives, the process is now attached directly above the plastic layer on the metal layer. The inner wall of the steel pipe is corrosion resistant coating, the standard wire rod material diameter is 27.8mm + 0.2mm, the steel tube wall thickness is 0.7mm, 0.8mm, 1.0mm, 1.2mm and 2.0mm. Bar products are from pipe and bar connecting pieces of a module of the system, can be any creative ideas into a practical personalized, and extremely simple and rapid, low cost. Two. Material and composition of wire rods Bar called lean pipe, steel plastic composite pipe or flexible tube is made of high quality steel after surface treatment, welding steel pipe with plastic resin, the outer surface of plastic using a special thermoplastic adhesive layer, inner surface coated and. For environmental protection, metal layer and plastic layer between adhesives do not use bonding, and now the process is plastic layer directly attached to the metal layer. After the composition of products, with beautiful appearance, wear resistance, corrosion resistance, bright color, rust proof, pollution-free and other features, is an ideal alternative to stainless steel products. Standard wire rod material diameter is 27.8mm + 0.2mm, steel tube wall thickness 0.7mm, 0.8mm, 1.0mm, 1.2mm and 2.0mm. The appearance and color can be different according to different requirements.