NIUNIU Material: The drill socket adapter made from heat treated hardened Chrome Vanadium Steel to ensure a long lifetime through tough torque jobs without breaking or rusting heavy duty construction to be compatible with the most powerful impact driver. DESIGN: The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Double tooth hex shank specifically machined to fit securely into a hand held driver, drill driver or impact wrench. Multifunctional: The extension bit holder is designed to provide a securely locked in extension to your existing tool. Provides additional length to reach into a multitude of hard to reach space. Attach these extender bars to any powered or cordless drill chuck or Impact driver to turn it into a high speed nut driver. Colour: Black Size: as shown Package Contents: 5pcs Color Conversion Post Hex Handle Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.