About this itemPackage contains 5pcs screw extractor + 1pc storage box, the screw filing kit removes damaged screws quickly and accurately.The 5 piece screw extractor set works with all drills and all sizes of screws and bolts. Sizes: 3-6mm, 6-8mm, 8-11mm, 11-14mm, 14-18mm.Used for home, office maintenance, etc., to remove all kinds of broken head bolts , screw. Practical and efficient.Square end discs, it is compatible with Quick Connect Chuck systems.Made of chrome-vanadium steel, high strength, high resistance to corrosion. wear and durability.5-piece heavy-duty steel extractor - different sizes of screw extractors to meet different needs.Reverse-threaded drill bits allow easy removal of screws , bolts, studs and threaded pipe fittings.It will be easier to remove damaged, peeled, rusted or cracked screws from any wood or metal surface.< p>Sizes: 3-6mm, 6-8mm, 8-11mm, 11-14mm, 14-18mmHow to use it:Step 1: Set the electric drill on the lowest speed.Step 2: Drill a deep hole in the damaged screw (congratulations size should be smaller than the screw)Step 3: Select an appropriately sized pullerStep 4: Put in the hole and rotateColor: as the picturelucky meetNote: the data is manual measurement, please allow 1-74cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.