This product is made of high quality cold heading steel by cold forming and heading process with single hit. Its thread is produced by three roller thread-rolling technique which has an advantage of high tensile yield strength and precision with better surface finish. The surface is processed specially to reduce the coefficient of friction after plated with zinc-nickel alloy, which provides high corrosion resistance and low coefficient of friction. This product with thread of M10x1.0 and M12x1.0 etc is commonly used in automobile brake line system. In order to meet customer’s zero defect requirement, the optical screening instrument has been utilized in the production line to carry out 100 percent inspection in addition to company’s other stringent quality control processes. This product has been utilized in muItiple domestic brands of car.