Stable storage box with 7 Heller ProStone masonry drills: 4, 5, 6 (2x), 8, 10, and 12 mm. The ProStone masonry drills drill quickly, efficiently, and reliably into stones and are very well suited for use in cordless drills. The 4-way spiral quickly transports drill dust away. The use of a robust carbide plate ensures a long lifespan. The ProStone masonry drills are suitable for masonry, clinker, aerated concrete, natural stone, and sand-lime brick. These drills can also be used for hammer drilling; however, the Heller ProXtreme concrete and natural stone drills are better suited for that purpose. The drills have a round shank, making them compatible with quick-change or keyless chucks. The storage box is made of shatterproof ABS plastic.