DRIVER TO DRILL: This unique converter will turn any 1/4 cordless power screwdriver into a drill or grinder for all your drill bits up to 3.8 mm (0.15 inches) in diameter. This tool gives you the freedom of one-handed drilling with both left- and right-hand rotation. QUICK INSTALL: This drill chuck for impact driver goes from driving to drilling in seconds to keep up with the pace of your job by a simple plug and play action. Our impact drill adapter accepts drill bits up to 1/4" diameter making this the perfect tool for any home or garage setting. KEYLESS DRILL CHUCK: The keyless chuck securely holds round-shank drill bits without the need for keys or extra tools to install the drill bit onto your cordless screwdriver giving you a quick and easy transformation to a cordless power drill. 1/4 FIT HEX KEY ADAPTER: The 1/4 hex impact wrench adapter shank easily inserts into your standard impact driver with ease letting you switch from task to task instantly. This chuck can convert an impact driver into a driver drill quickly and efficiently. NOTE: If you plan to drill through hard metal such as steel and if especially thick, then please use a wrench or a plier to tighten the drill bit into place for secure and accurate drilling.