What are the plastic connectors called (for glassware)?

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:


[![enter image description here](https://i.stack.imgur.com/9SC81.jpg)](https://i.stack.imgur.com/9SC81.jpg)




Those are called **Keck Clips**. 24/40 is the size of the joint.


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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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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>


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