Vega Industries VEGA-1KCA1 1/2in Keyless Chuck Adapter

Convert your impact driver into a drill driver
Jaw opens to 1/2 in and can be used with bits up to 1/2 in in diameter
1/4 in shank with power groove makes it compatible and easy to use with an impact driver
Jaw design locks both hex and round shank bits in place.
Mechanism turns smoothly allowing for more control and the ability to change bits in and out quickly