| | Punchhole - Wikipedia, the free encyclopedia |
 | | The left margin of a printed document should be 20-25 mm wide, to accommodate for the ISO 838 punchholes. |
| | Sheets punched with the four holes of this system can also be filed in ISO 838 two-hole binders. |
| | In the United States (and in part also in Canada and Mexico), a different system with three filing holes is widely used, which is incompatible with the International Standard. |
| en.wikipedia.org /wiki/Punchhole (349 words) |
