Package Includes: The hexagonal socket adapter have 4 pieces in total, black, the size is 5 x 1.25 x 0.63 cm / 1.96 x 0.49 x 0.24 inch, 1/2 square internal thread driver to 1/4 hexagon internal thread socket adapter, create a convenient environmentto you. Premium Material: The drill into nut driver constructed of high quality steel with good durability and high impact resistance. Extended post for easy replacement of the bit and sleeve, stable clamping, can be used with power tools. Secure Locking 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 into a hand-held driver,drill or impact wrench. Easy To Use: The hexagonal socket adapter installation is very simple and can be completed in one minute. The telescopic bullet sleeve conversion head is very convenient to convert the sleeve. You can directly install it manually without additional tools. Wide Application: Suitable for screwdrivers or power drill has a quick change of 1/4 inch chuck systems or directly into drill chuck. Change your hand tools socket sets into an impact, drive sockets. Great for household maintenance and general repairs.