Bore hardwood, softwood, plywood and drywall with Greenlee's self feeding spade bits. Innovative self-feeding design requires less effort and reduces vibration. Unique tapered design allows existing hole enlargement. 1/4-Inch Quick change hex shank. Forged and heat treated for long life. For use in 1/4-Inch (6.4 mm) or larger power drills. Hole in top center of bit for wire pulling.