Multifunctional Coating,Multifunctional Coating Project,Environmental Protection Coating For Exterior Wall,Interior Wall Environmental Protection Coating Wonsail New Materials Technology Co., Ltd , https://www.wonsailcn.comI have worked in the factory process department for many years and designed a large number of special inspection tools. For example, check the center hole of the two holes, the distance from the hole to the end face, and the like. In the process of designing special inspection tools, the measuring mandrel shown in Figure 1 is often used. It is matched with the template for testing. Sometimes it is added with auxiliary mandrel or positioning mandrel. It is convenient to measure and has high detection precision.