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2. Perforated metal - Wikipedia

   en.wikipedia.org/wiki/Perforated_metal

   Perforated metal, also known as perforated sheet, perforated plate, or perforated screen, is sheet metal that has been manually or mechanically stamped or punched using CNC technology or in some cases laser cutting to create different holes sizes, shapes and patterns.

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   Sometimes the sheets were welded together. A typical later PSP was the M8 landing mat. A single piece weighed about 66 pounds (30 kg) and was 10 ft (3.0 m) long by 15 in (0.38 m) wide. The hole pattern for the sheet was produced to allow easier transportation by aircraft, since it weighed about two-thirds as much.

4. Micro perforated plate - Wikipedia

   en.wikipedia.org/wiki/Micro_perforated_plate

   Another use has been the creation of narrowband Helmholtz absorbers which can be tuned by hole size and the dimensions of the hole distance and air gap behind the panel. However, when the hole dimensions are in the region of 0.05–0.5 mm, the narrow absorption peaks become much wider, making the additional fiber absorber more or less ...

5. Perfboard - Wikipedia

   en.wikipedia.org/wiki/Perfboard

   Top of a copper clad Perfboard with solder pads for each hole. Perfboard is a material for prototyping electronic circuits.It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing.

6. Sheet metal - Wikipedia

   en.wikipedia.org/wiki/Sheet_metal

   Sheet metal is available in flat pieces or coiled strips. The coils are formed by running a continuous sheet of metal through a roll slitter. In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its ...

7. Perforation gauge - Wikipedia

   en.wikipedia.org/wiki/Perforation_gauge

   Many U. S. stamps have been perforated 10½ x 11. As the name for a philatelic tool used to measure perforations. [ 1 ] Invented in 1866 by Jacques Legrand , the typical "perf gauge" (sometimes called an odontometer) is a metal or plastic tile on which perforations of gauges ranging from 7 and 7½ to 16 and 16½ are marked (the marks sometimes ...