Over center single flute design for cleaner holes and less splintering. Unique cutting edge designfor fast and smooth cutting action. Shorter than the top competitor"s bit for better access to tight spaces between studs and joists. Perfect for drilling 2 IN and 4 IN joists. Augers have self-feeding screw point that draws bit through all woodtypes with less operator fatigue. Eliminates the need for special tools such as expensive right angle drills or multiplesteps to cut the hole to size. 1/4 IN hex quick change design for fast and easy use in all drill types. Clearly marked with bit diameter and catalog number on shank for easy identification.