Premium Material: Made from high-quality steel, tempered and quenched at 600°C, with -70°C low-temperature ice forging technology to break through technical bottlenecks and enhance toughness. Resists chipping, corrosion, and rust, suitable for various working environments. Exquisite Design: Anti-drop hole design can be used with pins and leather rings to enhance anti-drop protection; concave interface with high conformity for easy embedding and wear resistance, providing a more secure bite. The socket wall is as thin as 2.0mm, allowing use in narrow spaces between screws—convenient and efficient. Hexagonal Design for Maximum Torque Efficiency: The extension bar features a hexagonal hole structure to maximize torque transmission, making the tightening and loosening of bolts and nuts faster and more convenient. You'll complete tasks with less effort, saving valuable time on every project. Wide Compatibility, Multi-Purpose Use: Suitable for automotive repair, mechanical maintenance, and home renovation projects, meeting various user needs. Equipped with a universal 1/2-inch air impact wrench adapter, it is seamlessly compatible with air and electric impact wrenches, expanding the tool's functionality. Set Contents: This set includes 7 precise sizes—8mm, 10mm, 12mm, 13mm, 14mm, 17mm, and 19mm. Each extension bar provides a tight and high-precision fit, locking onto fasteners to ensure a secure grip during use. Perfect for tire changes, mechanical repairs, and any task requiring stability., Manufacturer: LuLobtg