[One-handed drilling design]: Easily tighten with one hand thanks to the exclusive one-sleeve design. [Applicable scope]: Suitable for the power of 1050W above the impact drill bit, easily locks and releases drill bits, quickly convert your quick change hex shank driver into a drill. [Perfect Accessory]: Universal 1/4 inch hex driver easily attaches in the electric screwdriver, mainly used in automobiles, garages, warehouses, offices, etc. [Keyless]: The chuck firmly holds round shank drill bits. [Installation]: Easy to use and install, keyless chuck converter to go from driving to drilling in seconds. Note: Please note that the new type and the old type of this product will be sent at random and make sure you don't mind before ordering. Specifications: Tail Chuck Thread: 3/8Inch-24UNF Chuck Diameter Range: 0.8mm-10mm With 1/4 inch Hex Chuck Adapter Suitable for 9.3mm spindle Material: plastic + metal The black color Diameter of chuck: 40mm / 1.57 inch Chuck Height: 50mm/1.96inch Hex Chuck Adapter Size: LDia/506mm/1.960.23inch Package Included: 1 Chuck 1 1/4 inch Hex Chuck Adapter Note: 1. Please allow 1-3mm error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.