A tool case including a base having a lower surface and a tool holder insert supported by the base. The lower surface of the base defines a plurality of guides. The tool holder insert includes a base portion, an insert portion extending from the base portion in a first direction, a main body portion extending from the base portion in a second direction that is opposite the first direction, and a wing extending outwardly from the base portion. The insert portion engages one of the plurality of guides. The main body portion is configured to receive an oscillating multi tool blade, and the wing has a detent that engages another of the plurality of guides.