These are key to making a  mask work for various sized faces.
I wish I could draw a diagram of how I use these toggles.  I will try to explain it.  First you need to have a seam on the ends of the masks or if you are making them yourself, overlap the material to make a narrow channel for the elastic cord to slide through.  Then I take a hair "PIN" not a bobbie pin. and slide the pin over the elastic with the curved back of the pin towards you. The narrow ends of the pin will fit nicely into the holes of the toggle. push the pin through the toggle bringing the elastic cord with it and slide the toggle down the elastic. Pull the toggle up and down to tighten/ loosen the elastic.  It will make your mask perfectly adjustable and comfortable. When I make masks for my family I send extra toggles and a hair pin with them.  It is much safer with the new virus variants to have a secure fitting mask.
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