Description: The Universal Socket is extremely hard, which is made of chrome vanadium steel. When the socket covers the screw, the steel rods that firstly comes in contact with the screw will shrink to the inside of the socket, and the surrounding steel bars will hold the screw. It is the stretchable steel rods that make the universal socket twist almost any specifications of screws. Features: 1. Easy to disassembly and assembly various shape of nuts, hooks, lag screws and more. 2. Self-adjust to fit a variety of fasteners. 3. Made of chrome vanadium steel, which is high in hardness and toughness, wearproof and durable. 4. Can work with power drill.. 5. Commonly used in automotive industry, household maintenance, construction, etc. Specifications: Material: Chrome Vanadium Steel Surface Treatment: Plating Color: Gold, Red, Purple, Green, Black, Blue(Optional) Model: 7-19mm/0.28-0.75in Combination Size(L*W): 9.2*2.5cm/3.62*0.98in Weight: Approx. 160g Package Includes: 1 x Universal Socket 1 x Connecting Rod 1、Easy to disassembly and assembly various shape of nuts, hooks, lag screws and more. 2、Self-adjust to fit a variety of fasteners. 3、Made of chrome vanadium steel, which is high in hardness and toughness, wearproof and durable. 4、Can work with power drill.. 5、Commonly used in automotive industry, household maintenance, construction, etc.