A nester is a necessary component when using the nested type (insert type) of plate type. The nested type is mainly used for precision molds, and the advantages of using it are as follows: -The nested type is mainly used for precision molds. -The material of the nests can be changed to tungsten carbide or other materials. -When the nests are worn out, they can be regirded. -When the nests are damaged, they can be replaced.