Eagle Tool ETS750361 Installer Drill Bit, Interchangeable Switch Bit, Screw Point, 3/4-Inch by 36-Inch, Made in the USA Interchangeable with heads ETH500 and ETM500 Interchangable with shanks ETSHK21, ETSHK22, ET25015, ET25021, ET25051, ET25069 Add a Quick Switch Hex to adapt to a Quick Change chuck part number ETHXKIT250 Aggressive and self-feeding screw point and easily removable for sharpening. Replaceable set screw and allen wrench kit ETAKIT1. Wire fishing accommodation holes in the head and in the three flat non-slip grip