Then you can select the correct size of perforation you need and examine the pattern and specifications.

New:
Photochemical etching is an ideal process for grids, screens, meshes, filters, separators and other perforated metal applications.

The etching process produces consistent, burr-free holes as small as .004" in .002" thick material. As a general rule, minimum hole size is 110% of the thickness of the material, e.g. on .010" material, the smallest hole would be .011."   The etching process also produces all kinds of one-side pattern.