... Aperture 3-30mm * Anti-rust, good appearence,solid Stainless steel Perforated metal sheet ceiling Perforated metal mesh also called ... hole, five-pointed star-shaped hole , irregular holes, and so on.4. Application: Widely used in chemical ... , pharmaceutical equipment, food and beverage machines, cigarette machines, harvesters, dry cleaning machines, ironing table, silencing equipment, refrigeration ...