This is an 8-piece screw extractor set (also known as an "easy-out" tool kit) housed in a red plastic case, which appears to be designed for removing broken, damaged, stripped, or rusted bolts and screws.Overview of the KitContents: An 8-piece collection of tapered, threaded steel extractors of varying sizes, accompanied by a small starter drill or guide component in the upper left corner.Material: Typically forged from high-carbon or chrome-vanadium steel with heat-treated, deep-cut reverse threads.Function: Used by drilling a pilot hole into a snapped or stripped fastener, inserting the matching size extractor counter-clockwise, and turning it out.