【HIGH QUALITY】— Made of high quality 304 stainless steel, which is characterized by its strength and has good corrosion resistance in harsh environments such as high temperature, cold and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can guarantee a long service life. According to the standard metric system. And the average error is less than 0.01mm. Nuts and flat washers enlarge the contact area and reduce pressure to protect screws and parts. Compact and uniform screw thread is not easy to deform and slip during the rolling and installation process. the magnetic properties of stainless steel from other materials, which means that the magnetic properties of 304 steel still have weak magnetic properties.【PACKAGE】— All screws and nuts are packed in a durable box and sturdy to effectively support the weight of the whole package. In order to prevent the screws from being scattered or lost during use, we specially pack for each