This pen extender is easy to use and fits most colored pencils (both hexagonal and round) that I own. However, thicker bodied pins can either deform the part of the extension that holds the pins in place or not fit at all. It's not a big problem for me as I've only had a few pins that didn't fit. If you use other Koh-I-Noor products I can confirm that the Polycolor crayons fit in the extender (although the extender scratched the outside of the pen when removed) and the pens in the Gioconda set are too thick for this extender are than they are difficult to insert, so take them out.
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