Hitachi 725405 3/8-Inch Keyless Conversion Chuck for 1/4-Inch Hex Impact Drivers High rotational torque capacity Patented key-less locking mechanism prevents bit spin 1/4-inch hex quick connect allows users to change from fastening to drilling easily Fiber reinforced composite material provides strength without adding significant weight Comes with a 30-day limited warranty Converts 1/4-Inch hex drive for drilling applications up to 3/8-Inch shank drilling and driving bits High rotational torque capacity Patented key-less locking mechanism prevents bit spin 1/4-Inch hex quick connect allows users to change from fastening to drilling easily Fiber re-inforced composite material provides strength without adding significant weight