10 Piece Screw Extractor and Left Hand Drill Bit Set, Easily Remove Stripped Screws and Damaged Bolts, IncludesScrew and bolt extractor set includes 5 left hand drill bits and 5 screw extractor bits that range in size for removal of most common size screws and bolts. A metal case is included to store all 10 bits. Easy to use simply set your drill to reverse direction and use the drilling bit to drill a pilot hole into the center of the damaged screw or bolt, then hammer the corresponding extractor bit to drive the threads into the hole. Secure the bit to a tap