Here's some information about perforated sheets: What they are Perforated sheets, also known as perforated metal, perforated screens, or perforated plates, are sheets of metal with holes punched or stamped into them. How they're made Perforated sheets are made by punching or stamping holes into a sheet of metal using CNC technology or laser cutting. Hole patterns Perforated sheets can have a variety of hole patterns, shapes, and sizes. The distance between holes is called the pitch. Uses Perforated sheets are used in many industries, including construction, architecture, chemicals, food, and automotive. Benefits Perforated sheets are durable, weather resistant, and have a high strength-to-weight ratio. The perforations reduce the weight that a building's framework needs to support. Types of materials Perforated sheets can be made from a variety of materials, including aluminum, brass, steel, and stainless steel. Stainless steel is a little cheaper and more durable than aluminum and copper.