Capital Plastics fitting tool for all plastic holders. On rare occasion there will be a coin that will not fit inside the designated coin holder. When this happens do not panic, this tool is designed to help the coin fit. "Because all coins vary in size somewhat, we have available, a coin fitting tool which will permit you to increase the size of the coin opening. If the coin opening is too small, use one of our triangular coin fitting tools to scrape a small amount of acrylic out of the inside of the opening. Please do NOT attempt to file or cut the opening. If the opening is too large, use a thin narrow strip of clear Mylar or acetate as a shim when placing the coin in the opening." - Capital Plastics