Greenlee, 1-pack BIT. Spade Bit, Self Feeding, Diameter: 7/8" (20 mm), Hex Shank 1/4". Bore hardwood, softwood, plywood and drywall Innovative self-feeding design requires less effort and reduces vibration Unique tapered design allows existing hole enlargement ¼ IN Quick change hex shank Forged and heat treated for long life For use in ¼ IN (6.4 mm) or larger power drills Hole in top center of bit for wire pulling P.O.P. (34A-7/8)