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2. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...

3. Comb binding - Wikipedia

   en.wikipedia.org/wiki/Comb_binding

   To bind a document, the user first punches holes in the paper with a specialized hole punch. Pages must be punched a few at a time with most of these machines. If hard covers are desired, they must be punched as well. In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document.

4. Wire binding - Wikipedia

   en.wikipedia.org/wiki/Wire_binding

   The 3:1 pitch hole pattern is most commonly used for binding small documents with double loop wire. Spines are available in sizes between 4.8 mm (3 ⁄ 16 in) and 14 mm (9 ⁄ 16 in) in diameter. The hole pattern can use either square or round holes.

5. Punched tape - Wikipedia

   en.wikipedia.org/wiki/Punched_tape

   Tape for punching was usually 0.00394 inches (0.100 mm) thick. The two most common widths were 11 ⁄ 16 inch (17 mm) for five bit codes, and 1 inch (25 mm) for tapes with six or more bits. Hole spacing was 0.1 inches (2.5 mm) in both directions. Data holes were 0.072 inches (1.8 mm) in diameter; sprocket feed holes were 0.046 inches (1.2 mm). [8]

6. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   A 3/4 inch conduit size punch actually punches a hole that is approximately 1.1 inches diameter for 3/4 nominal size conduit. A dimensional size punch makes a hole very close to the indicated size. Punch sets are available on both imperial and metric sizes. Chassis punches are available in a number of shapes, round being the most common.

7. Punching - Wikipedia

   en.wikipedia.org/wiki/Punching

   Usually, the punch and die are close to the same dimensions, creating a sheared edge when they meet. A punch that is significantly smaller than the die can be used to produce an extruded hole where the punch displaces the punched material to the sides, forming a tube perpendicular to the punched sheet. [2] [3]