The Shockwave Impact Extractor Set from Milwaukee Tools are designed for removing damaged, stuck or corroded fasteners. These extractors are made from thick, hardened alloy steel that is reverse threaded and tapered. This set features laser-etched and color-coded bands that help users recognize and identify the size they need for the job at hand. The set comes in a flexible plastic holder to prevent pieces from getting lost in storage bags, totes or carts.