Generally, the shape accuracy of the product or the dimensional accuracy is used as a "measure" of die accuracy. Products that require very strict tolerances, for example, lead frames or IC connectors, etc., are products that require very high accuracy, and dies for producing these are recognized as the high accuracy dies. This is a point which with no body's question.

Plate constitution is one of the elements that determine the structure of a die. The plate constitution has a deep relationship to the method of preparing the major plates of a die. The details are explained below, see  [Fig. 1] below: