The Alpen-Maykestag 0000802122100 Drill Set is a pack of 9 drills that come inside a plastic case. The sizes are 3mm, 4mm, 5mm, 6mm, and 8mm. All drills are made by Alpen-Maykestag and are suitable for various DIY, construction, and repair jobs. The drills can be used with cordless drills, hand power drills, and pillar drills. They are made of hardened high-speed steel for long-lasting performance.