Hitachi 307543 3-Jaws 1/4-Inch NSI Hex Adapter Drill Chuck This adapter has a thread of 1/4-inch Hex to 1/2-inch 20-thread mount Ensures high precision and durability for heavy-duty tasks Quick change connector allows for fast and easy one-handed bit changes without re-chucking Ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Comes with a 30-day limited warranty A thread of 1/4-Inch Hex to 1/2-Inch 20-thread mount Ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Allows a quick change Ensures high precision and durability for heavy-duty tasks Comes with a 30-day limited warranty