1. from the product surface treatment: well made out of sheet metal products is very smooth on the surface and surface is smooth. Sheet made out of was cratered with poor layers of surface treatment, surface treatment does not fill the surface defects. Some small bubbles, or yellow, and so on. These are defective.
2. from products of edge and internal to: good of products production out is to after Burr processing of, such products not scraping hand or ugly; again good of mold using long has do out of products will health Burr of so to for processing of; poor of products health out not for surface processing on directly assembled forming, such on can saves part costs, with up on will scraping hand or to opened, this called Jerry.