Brand new, unused item. I am selling it because I accidentally purchased it. Product Description: Drills a hole in the center of the screw mounting hole in one shot. Features: - Allows drilling in the center of the mounting holes for handrail fittings, hinges, and reinforcing brackets. - The chuck can be attached and detached from both directions, allowing for easy removal of the bit. - Can be used with an impact driver. Notes: * Please use with power tools at 2500 RPM or less. ● You can drill pilot holes for screws in the center of hinge (metal fitting) holes, so the countersunk heads of the screws will fit neatly into the hinge (metal fitting) holes. Work efficiency is further improved with the easy-to-attach/detach [new function socket]!