The 2x2 cardboard holders will fit nicely into your 20 pocket pages. However, they are too snug to house a casino chip which is why many chippers use the 2 1/2" x 2 1/2" holders ... or crown-size that Bob Orme referred to ... which you can purchase 12 pocket pages for that size holder. One of the advantages of using 12 pocket pages is that they tend not to be as heavy as the 20 pocket pages, thereby not tearing the page holes as frequently for storage in 3-ring binders.