The most important part of the car mould is the overlaying die. This type of mould is mainly cold stamping die. In a broad sense, "car molds" is the general name for all the parts in a car. For example, stamping dies, injection moulds, forging dies, casting wax molds, glass molds, etc.

The stamping parts of the car are generally divided into covering parts, beam frame parts and general stamping parts. The stamping parts which can clearly indicate the characteristics of automobile image are automobile covering parts. Therefore, more specific car molds can be said to be "auto covering parts stamping die". The car covers the die. For example, front door panel trimming die, front door panel punching die, etc.