I'm not sure, but it looks like a hole hawg for sure. I started using these tools when I first started doing underground construction. They really suck. there accuracy is very unpredictable. Then I tried a grundomat from tt technologies, and there is no comparison. The step cone design makes them travel great distances very accurately. I find myself digging exit pits about 12" wide, and if you aim it right, it will come out perfect every time. they are more expensive. but well worth the extra $
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