The Extension Bar can be added between a ratchet and socket to extend the range of the socket. Made with heat-treated Chrome-Vanadium steel construction for long-life durability. The Mirror-chrome finish is corrosion resistant. Spring-loaded detent ball ensures socket is secured. Perfect size to be included in an emergency tool or tire repair tool.1/2 inch square drive, 9.84 inches (250mm) total length. Spring-loaded ball at male end retains sockets securely and prevents them from dropping. Widely used in DIY hand-making, household maintenance, and most general repairs. Made of high-quality steel, high strength and good wear resistance, durable to use. Compact size, high torsion force, high work efficiency, and simple operation. T-type handle with an ergonomic design that makes it easy to operate, comfortable to hold. Slide bar socket wrench can be flexibly applied for various sizes of screws The maximum recommended torque for a 1/2" extension of any length is 3500 In-LB