Leather style is a writing method of brush in calligraphy; Punching used in hardware processing mainly refers to burrs, sharp corners and acute angles at the corners of products after mechanical processing.
Criticism is a bad phenomenon due to engineering technology and other reasons. In actual production, the front end of the batch will bring many influences, such as poor appearance, and in serious cases, the front end of the batch will cut through other objects. Penetrating the front is generally a writing method when writing with a brush.