My little micro mini excavator came with one when I bought it. The excavator is only 19hp so cant have that much hydraulic flow but my father loved it for putting in 8in holes for a split rail fence a few weeks ago. Dosnt work well in rocky/root clay like we have but at least you have down pressure and reverse. I'm going to put 12in holes in for a wood shed in a few days. I have the same terrible shale/clay soil.