Product quality: The screw extractor set is made of chrome vanadium steel, with high hardness, after secondary tempering, strong and durableProduct use: Left hand drill and extractor, suitable for removing damaged, rusted or peeling screws, studs, , fasteners and faucets, water pipes, can also drill on walls, metal, plastic, wood, brick holeEasy to use: One-way screw removal tool, first drill a hole in the center of the broken nut with a suitable drill bit, then tap the screw extractor into the hole lightly, then use a wrench to turn the screw in the loosening direction to remove itSize and Diameter: Both the drill's diameter and the suggested extraction diameter for broken screws are engraved on the extractor's boxNote: This household tool can remove damaged , screws, studs, and drill bits. It can be used in conjunction with an electric drill. The thread direction of the screw is positive, and the thread direction of the tap extractor is reverse.: Chrome vanadium steelcolour: blackPackage Contents:1 set x Tap ExtractorsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.