Extreme durability high speed steel cutting edge for superior durability in nail embedded wood stays sharper longer|Clean holes and easy removal chamfered edge allows bit to be removed easily after drilling flutes remove excess wood chips|Fast, easy drilling aggressive lead screw tip pulls the bit through material quickly and effortlessly|Increased value - extra lead screw and wrench included in every package|Deeper cuts longer shank that cuts 4 x 4 in without extension|Quick change - impact hex shank allows for quick changing of the bits|Replaceable coarse screw point drills quickly in dry, wet and gummy wood|1-3/8 in entrance for tubing|Chamfered edge allows bit to be removed easily after drilling|Aggressive lead screw tip pulls the bit through material quickly and effortlessly|Extra lead screw and wrench included in every package|Longer shank that cuts 4 x 4 in without extension|Impact hex shank allows for quick changing of the bits