Damaged Screw ExtractorMade of highquality highspeed steel material, hardness reaches HRC60-63, good abrasion resistance.Screw extractor is made of high quality High-Speed Steel . High hardness, durable and easily remove damaged screws In one stepThe stripped screw extractor set is included two extension bit holder. Can remove in one step, do not need to conversion the extractor or adjust the chuck Extremely VersatileThe kit contains 6 different sizes of screw extractors, suitable for different broken screw extraction situations.The stripped screw extractor kit is includes 6 pieces of stripped screw extractor to satisfy all you demand. Suitable for any sizes screw or bolt MultipurposeUsed to quickly and easily pull out broken screws, pipes and bolts that cannot be removed with a standard screwdriver.Suitable for allen bolts, machine screws, lag bolts, wood screws, hex bolts, sheet metal screws and other screws ImportantIt is best to use electric hand drill, can not be used the hammer drill mode Must be low speed during use Specification: Item Type: Screw Remover Material: High speed steel Purpose: Take out broken screws Package List: 6 x Screw Remover 1 x Storage Box Application Scope: 1/8-1/4in (M3-M6) 1/4-5/16in (M6-M8) 5/16-7/16in (M8-M11) 7/16-9/16in (M11-M14) 9/16-3/4in (M14-M18) 3/4-1in (M18-M25)