Features: _x000D_ This set is designed to remove damaged, rusted or stripped screws, bolts, fasteners. _x000D_ Tool steel extractors have left handed spiral flute designed for extra gripping power. _x000D_ There are total 5 extractors in various sizes for screws of diameter from 4mm to 18mm._x000D_ _x000D_ Easy to use, drill a hole in the center of broken screw first, then use a proper extractor to take screw out. _x000D_ You may use an adjustable wrench to hold extractor firmly when removing screw. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: GCR15 tool steel _x000D_ Suitable Screws(Diameter): _x000D_ 1#: 4~6mm _x000D_ 2#: 6~8mm _x000D_ 3#: 8~11mm _x000D_ 4#: 11~14mm _x000D_ 5#: 14~18mm _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 5 x Extractors 1This set is designed to remove damaged, rusted or stripped screws, bolts, fasteners 2Tool steel extractors have left handed spiral flute designed for extra gripping power 3There are total 5 extractors in various sizes for screws of diameter from 4mm to 18mm 4Easy to use, drill a hole in the center of broken screw first, then use a proper extractor to take screw out 5You may use an adjustable wrench to hold extractor firmly when removing screw