I can't remember for the life of me, and google isn't making it easy. e.g. the things labeled 24/40 etc., as in this picture:
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Those are called Keck Clips. 24/40 is the size of the joint.
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1$\begingroup$ @khaverim very likely, as it is a Swiss idea (worldwide.espacenet.com/publicationDetails/…) $\endgroup$ – Buttonwood Jun 28 '17 at 21:26
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1$\begingroup$ Yes more or less, it's not the exact value. en.wikipedia.org/wiki/Ground_glass_joint describes the different types and the german wikipedia page actually shows the biggest diameter mm values. It's all in ISO 383 $\endgroup$ – DSVA Jun 28 '17 at 21:27
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6$\begingroup$ I used to call them "bethesda clamps". Gamers will know. $\endgroup$ – andselisk♦ Jun 29 '17 at 12:07
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They are called Keck clamps.
Here's a link to the page for ChemGlass: http://www.chemglass.com/product_view.asp?pnr=CG-145
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1$\begingroup$ There are versions in metal, too; like vaporbrothers.com/Metal-Keck-Clip-19mm_ProductID_8766 $\endgroup$ – Buttonwood Jun 28 '17 at 21:31
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4$\begingroup$ @JamesDealon Please direct your comment to ChemGlass. I don't have strong feelings about the name. The important part is "Keck." $\endgroup$ – Zhe Jun 28 '17 at 23:43
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The clips are named after Hermann Keck - Chemistry World's Classic Kit columnist, Andrea Sella, spoke to him to get the story of the invention before he died a few years ago. https://www.chemistryworld.com/opinion/classic-kit-keck-clip/3004921.article
