Mantic is a company that makes great war game miniatures for decent prices, unlike certain other companies who shall not be named that charge way too much. Their miniatures are often designed with a tiny +/- 15mm round base that fits into a corresponding socket on their proper diameter game bases. Maybe you want to use a different base size than the one included, or maybe you got one of their Christmas Crazy Boxes and need to base your miniatures. You probably should consider ordering a package of the real thing from the Mantic site if you have a lot of miniatures because they're a cool company, but this could tide you over if you only need a few. Note that the hexagonal bases are drawn at 25mm edge-to-edge. If this is not accurate, let me know and I will update the files accordingly.