The Earthquake 8 Inch High Performance Earth Auger Bit are engineered for unrivaled power and efficiency which makes drilling holes in any soil type easier than ever before. This earth auger bit features a replaceable screw point, replaceable carbide cutting blades with additional pilot flight, and a splined input shaft with Quick Connect Coupler. These three features provide increased efficiency for your powerhead which means more holes to get the job done faster. Patent Pending Design