High quality material: Made of high-quality 40CR material, it helps ensure the maximum durability of the impact screwdriver. The black oxidation treatment provides strong strength and extends the service life of the bolt remover. High strength and impact force: The bolt and nut remover is made of high hardness chrome molybdenum steel, and the reverse spiral groove design provides maximum gripping force through interlocking. Multiple sizes: Suitable for damaged bolts with a head size of 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 19mm, 21mm, 22mm, 24mm, and 27mm. Easy to use: Features a 3/8" drive that is compatible with standard ratchet wrenches, impact wrenches, sockets, and power tools. Can be used with metric wrenches or sockets. The bolt remover is also suitable for screw heads and studs. Metric compatibility: The nut remover is precisely designed to easily remove damaged bolts, nuts, and screws, including stripped or frozen ones. Reliable quality helps make tasks faster, safer, and more efficient. Specifications: Material: Steel Product sizes: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 19mm Weight: 350g / 580g Package includes: 10 pcs extractors