These Diorama (Unit) Washers come in a set of 2 65mm high-quality, plastic washers. The 60mm Unit Washer has an interior diameter of is 65.5mm (exterior diameter is 75.5mm) Custom Unit Washers* for use within our patent pending Modular Display and Storage Tray System** for use with hobby miniatures and models. These Unit Washers have been designed to give you the ultimate flexibility in arranging the TABLEWAR(TM) DESIGNS Unit Tray or Diorama Tray. Mix and match them with other sized Unit Washers. Arrange them, secure the, use them. You may attach them to a plastic or a metallic surface. Your hobby miniatures and models sit within the interior of these washers.