This square coaster holder will fit any of my 89mm square coasters. You may have to change the height depending on what thickness the cork backing is that you put on the back of the coasters. I use these Self-Adhesive Cork Squares, 3.5 x 3.5 Inches from Amazon. You will have to trim them to fit the square coasters.  I have included the link. https://a.co/d/9Us2u1Z

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