The drill bit holder features a quick-release design for efficient, hassle-free use, while the carabiner lets you hang it on your belt, tool bag, ladder, or more. Made from high-quality carbon structural steel and treated with high-temperature quenching to a robust construction. It is , heat-, and wear-, minimizing the risk of breakage or deformation for safe and reliable use. Compact and portable. Includes six sizes - 1/4inch(6mm), 3/8inch(10mm), 1/2inch(12mm), 5/8inch(16mm), 3/4inch(19mm), and 7/8inch(22mm). This HVAC tool set features a 1/4inch(6mm) hexagonal handle compatible with most electric drills. It expands copper tubes into a cylindrical or bell-shaped end through rotation, making it ideal for air conditioner repairs, refrigerator maintenance, copper and aluminum tube servicing, and more. Featuring a six-in-one design that eliminates the need for frequent size changes, this tool delivers tube expansion speeds when used with an electric drill-saving you significant time. (Note: The rotational flaring process generates heat; please wear heat- gloves, safety goggles, and other protective gear.), Manufacturer: Akfldms