The main function of the car grille is to provide air intake and ventilation for the water tank, engine, air conditioning, etc., to prevent external objects from damaging the internal components of the cabin during driving, and to showcase individuality and aesthetics. In automotive engineering, the grille is used to cover the vehicle body to allow air to enter. Most vehicles have a grille in the front of the car to protect the radiator and engine. The other common grille is located under the front bumper, in front of the wheels (cooling brakes), in front for cab ventilation, or on the trunk lid (mainly for rear engine vehicles). The grille is often a unique styling element, and many brands use it as their main brand identity. The metal grille originated in the American modified car market in the 1980s and quickly became popular. At present, the material of the metal mesh is mainly aviation aluminum as the substrate, because it is lighter than stainless steel substrate. The surface of the aviation aluminum metal mesh adopts * mirror polishing technology, and its brightness reaches the level of a blue mirror. The back end adopts black anti oxidation treatment, which is smooth like satin, making the surface mesh more three-dimensional and highlighting the personality of the metal material. The popular metal grille in the United States is influenced by its "garage culture" and often appears in the form of a "replacement" metal grille. The "replacement" grille replaces the original car grille with a new metal grille, which requires the removal of the original car grille, limited by personal dexterity and on-site tools.