In the description, "a standard size needle" and I can not find any other size specification. The needles, which I have received, have a thread with a diameter of about 8mm. To fit eg NOT to ERIMA air pump 30.5 cm (12 inches), black. So nix with standard size. If anyone knows needles that I would fit on the pump Erima appreciate a link ... Otherwise, we thankfully had a NoName Ballpumpe to have passed the needles and there are also no problems so far with it.