Package Contents: The hex socket adapter includes a total of 4 pieces, black, the size is 5 x 1.25 x 0.63 cm / 1.96 x 0.49 x 0.24 inches, 1/2 square female thread to 1/4 hex female thread socket adapter, creating a convenient environment for you. Premium Material: The drill-in nut driver is made of high-quality steel with good durability and high impact resistance. Extended post for easy bit and socket changes, stable clamping, can be used with power tools. Secure Lock Design: The adapter set is designed to provide a secure locking system in extension to your existing tool and provide extra length to reach into a variety of hard-to-reach spaces. Specially machined to fit securely in a handheld screwdriver, drill, or impact wrench. Easy to Use: The installation of the hex socket adapter is very simple and can be completed in one minute. The telescopic ball socket conversion head is very convenient for converting the socket. You can install it manually directly without additional tools. Wide Application: Suitable for screwdrivers or electric drills with a quick-change 1/4 inch chuck system or directly into the drill chuck. Convert your hand tool socket sets to an impact wrench, drive sockets. Perfect for household maintenance and general repairs.