Hitachi 321814 1/2-Inch 3-Jaws Metal Keyed Drill Chuck Capacity of 1.5-milimeter to 13-milimeter Thread is 1/2-inch to 20THD Chuck key number is 303334 Keyed chucks are recommended for drills with higher frequencies Comes with a 30-day limited warranty A capacity of 1/16-Inch to 1/2-Inch and a 1/2-Inch 20-thread mount Ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Recommended for drills with higher frequency Ensures high precision and durability for heavy-duty tasks Comes with a 30-day limited warranty