RanchEx 101020 Heavy Duty Auger - Replaceable Teeth, Commercial Grade, 18" Diameter - Black Takes the effort out of digging the right sized hole for the task at hand. Typically used for Category 1, 2, and 3 tractors. Can be used on the Dirty Hand Tools Model 100, and Model 110 post hole diggers (SKU 100498 and 100624). Commercial grade with replaceable carbide cutting teeth. Spiral tip for easy digging (tip is replaceable).