Really Useful Box 4L inserts

Inserts to fit Really Useful Boxes 4L and 9L boxes. Will also fit 19L boxes if the bottom layer is made slightly smaller than given. These were designed to hold miniature wargame figures in multiple layers in the boxes. Trays are 8 1/2 inch by 6 1/8 inch with variable heights. The height measurement given is the internal height so add 1/16 for the thickness of the base/walls.