50x75mm Rectangle to 105x70mm Oval Untextured - Rank and Flank Base AdaptersThese Untextured Base Adapters are designed to allow you to put your models on both circle and rectangle bases at the same time! Simply glue your model to the base adapter insert, and then you will be able to place it in either the oval or rectangle base, depending on which game you are playing. Both the bases and the adapter come with holes for 5mm x 2mm (3 16" x 1 16") disc magnets, which you can buy here.