Perforated Metal sheet in a variety hole sizes and patterns.
Amazon.com: FengYoo Perforated Metal Sheets Perforated Stainless Steel Sheet -Sheet Metal with Holes-20GA 0.4 Inch Hole 11.8 Inch X7.8 Inch-Suitable for Ventilation Smoking and Decorative Screen Style Grilles : Industrial & Scientific
Perforated Metal Patterns | Round, Square, Slot and Custom | Accurate Perforating
Why Choose Stainless Steel Perforated Sheets? - Astro Metal Craft
Perforated Metal Mesh Sheet Suppliers Melbourne | Metal Perforation