These "donuts" are like large, glue on eyelets!  They're great when you want your paper to have a flat back, instead of the metal curling in the back.  For example, you might have a photo behind the cardstock and might not want it to get damaged from the eyelet metal on the back. 

Other cute uses for these donuts - put a rhinestone in the center to make a larger "jewel".  The 6mm donuts have a 2mm hole for either a 6ss rhinestone or 2mm metal-e dot (rhinestud).   Or you can put a colored mini brad in the center of the donut! 

Use our Heat Tool with the 9mm flat tip to attach the donut to your project.  You can also use a household iron, liquid glue, or a mini brad as a fastener.  If you use the heat tool or an iron, do not overheat the donut.  Approximately 3 second should be enough time.  If you overheat the donut, excess glue may ooze out.