Hitachi 321812 3/8-Inch 3-Jaws Metal Keyed Drill Chuck Capacity of 0.8-milimeter to 10-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 1/32-Inch to 3/8-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