IRWIN HANSON Master Extraction Set, 48 Piece, 3101010 Includes spiral flute extractors, multi-spline extractors, bolt extractors, and left-hand cobalt drill bits for extracting all kinds of fasteners Easy out style spiral flute extractors for use on common fasteners and lower torque Multi-spline extractors for higher torque or lower profile tools Bolt extractors for freeing partly-exposed fasteners Left-hand cobalt drill bits for drilling out interiors of fasteners