This set of Neiko 04204A hex bolt extractors includes 25 pieces of different sizes, from 3 mm to 22 mm, with increments of 0.7 mm. These premium chrome molybdenum steel extractors are ideal for removing broken screws, bolts, plugs, fittings, threaded pipes, and pins. They feature aggressive multi-spherical teeth with left-hand spiral design for greater gripping power and faster threading. Additionally, each extractor has highly visible size markings for quick selection of the appropriate drill bit. The hexagonal head is specially designed to apply maximum torque with all types of wrenches. This set also includes a sturdy storage box to keep all the pieces organized and protected.