0.3-6.0MM Black Keyless Chuck Conversion Tool 1/4 Inch Hex Shank Connecting link: 6.35mm(1/4 ") Hex Shank Clamping range: 0.3-6.0mm Instantly convert impact driver to hold non-quick change drill & driver bits Quickly convert your quick change hex shank driver into a drill Unlimited use in automotives, garages, warehouses, offices, homes etc.