Task Tools T22279 Drill Chuck Key for 1/4-Inch and 3/8-Inch Chucks, 13/64-Inch Pilot Chuck key for 1/4-Inch and 3/8-Inch drills with keyed chucks Professional quality for quick and easy bit changes For cordless and electric drills Made of hardened tool steel for longer life Pilot size: 13/64-Inch