[One-handed drilling design]: Easily tighten with one hand thanks to the exclusive one-sleeve design. [Applicable range]: Suitable for 1050W power 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 screwdriver attaches easily in electric screwdriver, mainly used in automobiles, garages, warehouses, offices, etc. [Keyless]: The chuck holds round shank drill bits firmly. [Installation]: Easy to use and install, keyless chuck converter to switch from driving to drilling in seconds. Note: Please note that the new type and old type of this product will be sent randomly and make sure you will not mind before ordering. Specifications: Chuck Size Thread: 3/8Inch -24UNF Chuck diameter range: 0.8mm to 10mm With 1/4 inch hex chuck adapter Fits 9.3 axle mm Material: plastic + metal Color: black Chuck diameter: 40mm / 1.57 inch Chuck height: 50mm / 1.96inch Hex Chuck Adapter Size: L Dia / 50 6mm / 1.96 0.23inch Package Included: < p>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.