I have a Boss Double Eagle 2 speed (man. shift!) machine. The low speed is a SIGNIFICANT aid in boring harder woods. As for bits: They are, as most of us know, sometimes hard to find. Some hav cannibalized T-augers which are usually much easier to find. I have had very good results wit a Milwaukee 1 1/2" bit (new) which ist about 6-7" overall length. It fits nicely into the Boss. Good Luck!