Shockwave Impact Duty Extractors are engineered with an optimized geometry to grip and remove the most demanding stuck, rounded over, rusted, painted on, stripped, and damaged fasteners. Included with this set are (5) 3/8 In. square drive Impact Duty extractors for common sized fastener heads 1/4 In. to 1/2 In, as well as a 1/4 In. to 3/8 In. Shockwave square socket adapter for use in quick change impact drivers. Bits feature color-coded rings for quick and easy size identification and a retention holder to keep them organized. Ideal for heavy-duty impact applications, but delivers a full system solution for all drilling and fastening needs.