For auger bits what diameter? Milwaukee and others make auger bit extensions that have a quick-connect feature so you can make a bit as long as you want. They have extensions in 6", 12", 18" and possibly more (that's what I have). So long as your desired hole is wider than the quick connect you're good. I have older extensions as well that don't have the quick connect, instead they have the female hex to mate to the bit and one or two Allen key set screws. Those don't have the quick connect convenience but they are also a smaller diameter so they will fit through a smaller bore. I used that set up with an auger bit to bore holes through about 20" + of stacked 4" X 6" and 6" X 6" landscape timbers. I pounded 1/2" galvanized pipe through the hole to fasten them all together.
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