The Milwaukee® Shockwave Impact Duty™ Bolt Extractor Set is 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) 3/8in. square drive Impact Duty extractors for common sized fastener heads 1/4in. to 1/2in. as well as a 1/4in. to 3/8in. Shockwave square socket adapter with up to 30 times life for use in quick-change impact drivers. The 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.