RadiantOrchid Practical 1/4" Inch Keyless Drill Bit Chuck Quick Change Adapter Converter Hex Shank 0.3-3.6mm Clamping Range Color:Silver(as the picture). Connecting link: 1/4(6.3mm) Hex Shank. Clamping range:0.3-3.6mm. Material: Drop Forged #45 Carbon Steel. Brand new and high quality.