https://de.wikipedia.org/wiki/Heftklammer#:~:text=Heftklammern%20f%C3%BCr%20B%C3%BCro%2DHeftger%C3%A4te,-Klammerst%C3%A4be%20(24%2F6&text=als%2024%2F6%2C%2026%2F,und%2023%2F13%20f%C3%BCr%20ca.