[Unique design] This universal socket adopts a unique honeycomb design principle. The hexagon socket and round steel pin design can adjust automatically any size or shape, making it more flexible, and can be seamlessly and tightly engaged with the screw, not easy to slide. Suitable for standard 1/4 to 3/4 inch (metric 7mm to 19mm) screws, nuts and bolts, can meet all your needs. It’s small and light, and easy to carry. [High-quality materials] The universal socket adapter is forged from chrome vanadium steel, and the interior is composed of 54 high-quality CR-V steel pipes, which have the characteristics of high hardness, high torque, strong toughness and super durability. These steel pipes are respectively driven by springs, so that the sleeve can automatically adapt to any shape, and can be moved to different types of fasteners without replacing the sleeve. [Universal function] This universal ratchet wrench can be adjusted immediately to catch most metric, butterfly nuts, broken