What is the minimum aperture of the perforated sheet

The minimum hole diameter of perforated sheet is determined by the thickness of the sheet. There is an unsurmountable obstacle in the production process of perforated sheet, which is that the hole diameter cannot be less than the thickness of the sheet. This is the principle of the minimum hole diameter of perforated sheet.
 
For example, if the sheet thickness of perforated sheet is 1.0mm, the minimum hole diameter can be made 1mm;
If the sheet thickness of perforated sheet is 5mm, the minimum hole diameter can be made 5mm;
Therefore, the minimum hole diameter of perforated sheet can be made as small as 0.2mm, which can be produced by using a 0.1mm thick metal sheet.