IRWIN Ship Auger Car Bits 11/16" 12" TWIST Taper Shank Model 515t Six Count Buyer will receive six New auger drill bits for wood working . 11/16"bore 12" twist 18" overall. These are new bits from old stock. Never used.For use with hand auger drill or taper square shank can be cut off and then the bit can be used in a power drill.These shanks are made to be cut off if the buyer so chooses. Pole Auger Bits - Hand Brace / Adapter Shank • Extra-long twist is ideal for drilling large poles, construction timbers, and for other timber applications. • Cutting spur scribes the outside of the hole during drilling for a smooth, clean hole. • Taper square shank can be removed for use in an electric drill or hand brace. • Bit can be resharpened. • Medium-fast screw point is ideal for general wood drilling applications.