CR-V (chrome vanadium steel alloy) steel socket, 40 steel handle, built to last. Universal socket from 7 mm to 19 mm. Fits standard 1/4-3/4 and metric 7-19mm nuts and bolt heads. Unique design that automatically adjusts to any size or shape, compact and easy to carry. Perfect for automotive, household maintenance, manufacturing, construction and other industries, also popular with home decor enthusiasts. Package content: 1 pouch + 1 key + 1 link Features: This is a universal socket that instantly adapts to the socket of hex nuts, screw eyes, hooks, offset screws and bolt heads. Fits standard 7-19mm nuts and bolt heads. 1/4 to 3/8 . Drive adapter (7mm to 19mm) Universal 6-point socket for standard and metric bolts. For use with nuts, hex nuts, square nuts, eye screws, cup hooks and offset screws. Drill adapter that turns the electric drill into a power outlet Self-adjusting to fit thousands of bindings Eliminates rusted and damaged fasteners. Features Range of use: 7-19 mm. Content: 1