Description of the Product Having Holes of following Patterns : The Wonderful Things That Holes Can Do. Beside Filtration & Separation of liquids, solids & gases, Perforated sheets can provide the Perfect Solution to Multi-faceted design problems of Product Designers or Architects. Round Holes ROUND HOLES ranging from under 0.6mm to over 75mm account for 80% of the production of the perforating industry. Round holes can be produced with greater efficiency and less expenses than any other hole shape. The dies and punches to make round holes are the most cost efficient to build