Round Hole Perforated Metal

Round-hole perforated sheet — by far the most common pattern, and the one behind almost every ventilation grille, machine guard, speaker cover, walkway and architectural screen.

Specified as hole size on centre distance, in a staggered or straight pattern. The centre distance is what sets open area. How to read the spec.

Also see square hole perforated metal and slotted and oblong perforated metal.