The Diameter of Holes in CDs

  • The diameter of holes in CDs is perfectly 15 mm.

    CD の穴の直径

    This length is the same as the seven size of rings.
    CD の穴の直径は、15 mm です。

    People seem to express it as “four” in the US, “H” in the UK, respectively.

    If your girlfriend are putting a CD’s hole on her finger and it looks just fit, you should remember it.
    アメリカでは 4、イギリスでは H と表すようです。

    If you give a perfect size ring for your girlfriend, she must be surprised.
    もしあなたの彼女が CD の穴に指をぴったりはめていたなら、それを覚えておきましょう。

    Original sentence