Professional multi-purpose extractors. Two step, drill bit and extractor in one tool. Compatible with "quick-connect" chuck systems. Quickly and easily removes most damaged screws such as Hex, Phillips, Torx, Square Drive from wood, plastic or metal. Drill bit one end, extractor the other end of each bit. The drill bit end is used to prepare the broken/damaged bolt/screw for the extractor on the other end . The tool is used ONLY in reverse in a variable speed reversible drill. Precision engineered for multiple extractions and maximum performance. Self centering drill tip, no walking or wandering;works on jagged, uneven rough breaks. Serrated extracting end results in greater Torque for hard to remove bolts and screws. No grinding or centre punching required. See size chart for screw and bolt sizes covered by each bit/kit. MADE IN THE USA