Usage Tips:Our 3/8 impact adapter efficiently converts your hexagonal polygon size into square head size, enabling easy socket installation. It's the perfect conversion accessory that enhances your work efficiency, making your projects more convenient and quick. Crafted from heat-treated Chrome-Vanadium Steel (-V), our 3/8 socket adapters exhibit superior performance compared to your average high-speed steel tools. They offer impressive wear resistance and toughness, complimented by a blackened which not only adds an aesthetic elements but also enhances rust resistance and extends the Adapter Set's . With a square head size of around 10mm/3/8 inch and a hexagonal handle size of about 6.3mm/1/4 inch, these 3/8 socket adapters are designed for durability and precision. Each adapter comes with a spring ball-bearing part on the square head that ensures your socket stays firmly in place and avoids sliding during work. These socket adapters are designed for manual-driven applications or can be used with power tools alongside plug-in shanks. Perfect for use with handle nut drivers and drills, they allow you to operate your 1/4 Inch Hex Impact Socket with utmost ease, making your Automotive DIY or Extension Socket Driver Bits projects a breeze. Material: steel colour: black Package Contents: 10 x Connecting rod Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.