Feature:1. Spiral Cutting Teeth: The spiral cutting teeth provide positive grip for removing round or damaged screws2. Sturdy Tools: This is a set of 10 sturdy tools that can help remove nuts, bolts, screw heads, studs, etc3. Suitable Sizes: The sizes are suitable for its disassembly are 9, 10, 11, 12, 13, 14, 15, 16, 17, and 19mm4. Quick Working Tools: These tools can be used with electric metrics wrenches or sockets for improving your working efficiency5. Chrome Vanadium Alloy Steel Material: Made of chrome vanadium alloy steel, has high strength and is very durableSpecification:Item Type: Broken Nut ExtractorMaterial: Chrome vanadium alloy steelPurpose: Screw removerColour: BlackUse Caliber: mm / in (Approx.)Outer Diameter: mm / in (Approx.)9mm / 0.35in 16mm / 0.6in10mm / 0.39in16mm / 0.6in11mm / 0.4in17mm / 0.66in12mm / 0.47in19mm / 0.74in13mm / 0.5in19mm / 0.74in14mm / 0.55in21mm / 0.8in15mm / 0.59in22mm / 0.86in16mm / 0.6in24mm / 0.94in17mm / 0.66in24mm / 0.94in19mm / 0.74in27mm / 1.1in.Package List:10 xBroken Nut ExtractorNote:Please wear protective gear when removing the damaged nut to prevent the debris from splashing and hurting yourself.