collaborated with a domestic automobile enterprise to customize hardware brackets for car door stoppers. Using 45# carbon steel, formed by precision stamping and quenching processes, the bracket can bear 100kg. The limit gears are tightly engaged to accurately fix the door opening and closing angle. The wear-resistant rotating shaft enables smooth door opening and closing without abnormal noise, extending the service life by 3 times. The electrophoretic rust-proof surface resists humidity and oil stains inside the door, suitable for sedans and SUVs. This bracket increased the stopper qualification rate to 99.9% and reduced supporting model complaints by 68%.