From the Manufacturer
Bore hardwood, softwood, plywood and drywall with Greenlee's self standard spade bits. 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.
332-33A-3/4 Features: -Forged and heat treated for long life.-For use in 1/4'' or larger drills.-Hole in top center of bit for wire pulling.-Bit/Blade Mounting Type: Chuck.-Applicable Materials: Soft & Hard Wood, Plywood, Drywall.-Material: Steel.-Price is for 1 Bit.