RanchEx 101018 Compact Auger - Replaceable Tip, Commercial Grade, 9" Diameter - Black Typically used for category 0 and 1 Tractors Professional quality, long lasting construction. Spiral tip for easy digging (replaceable tip). Commercial grade with replaceable carbide cutting teeth. Can be used on the Dirty Hand Tools Model 90, and Model 100 post hole diggers (SKU 100623 and 100498).