Features Simpler Works: Designed to have a round handle with 9.3mm diameter, both the installation and operation are more convenient. Stable Fixing: The clamping range is 0.8mm to 10mm, and the firm fixing promises stable and efficient working performance. Free Matching: Allows for free combination with screwdriver, hole saw, drill, socket wrench and so on, simple and useful. Drill Adapter: This drill chuck can convert and extend the power drill to satisfy all your working needs in narrow places. Good Material: Combining high quality ABS and chrome vanadium steel materials, has excellent durability for long term use. Specification: Item Type: Drill Chuck Material: ABS + Chrome Vanadium Steel Function: Drill Extension Chuck Colour: Red Black Clamping Range: Approx. 0.8 ~ 10mm / 0.03 ~ 0.39in Round Handle Diameter: Approx. 9.3mm / 0.37in Package List:1 x Drill Chuck1 x Handle Package List 1 x Drill Chuck 1 x Handle