Neiko 20759A Keyless Chuck Conversion Adapter Tools with 1/2-Inch Shank Keyless chuck design with 3-jaw chuck securely holds round-shank drill bits with fast on/off operation No key function conveniently allows one hand operation for convenience and multi-tasking Strong chrome vanadium steel construction designed for heavy duty work while rubber chuck is designed for tighter grip Universal 1/2-inch hex shank driver snaps easily into the power tool with precision and power Versatile use on impact drills and electric power driver to quickly switch tasks and keep the job moving; not compatible with pneumatic tools THE IDEAL DRILLING ACCESSORY: Turns any cordless power screwdriver into a drill or grinder to quickly switch tasks and keep the job moving EASY ON AND OFF: Keyless chuck converter to go from driving to drilling in seconds KEYLESS DESIGN: 3-jaw chuck securely holds round-shank drill bits, and the universal driver 1/2-inch hex shank snaps into power screwdrivers ONE-HANDED DRILLING: Gives you the freedom of one-handed drilling and is ideal if youre working in tight spaces INSTANT GRINDER: Convert your cordless screwdriver into a cordless grinding tool