Product Overview
These are designed to fit in the top of the Milwaukee packout tool box lids (the type with aluminium on the corners).
These bit trays do not press fit into the openings, because you would basically need eight different types of bit tray. So tape or glue is required to keep these bit trays in place.
Even though every opening is shaped slightly differently, they still are somewhat symmetrical so you only need two different types of bit tray.