They are both wood bits the first one I wood prefer because it is faster becuse closer bitting surface the second one is the same as the first but would drill slower becuase the bit is more widely spaced.
The problem here is they never define what a single twist is or what a double twist is...... On page 82 we see a bit that is good for both woods and then on page 87 the bit is good for both woods.....aniceone2hold said:Page 81, paragraph 3 from the auger bit catalog verified that the double twist is for soft wood, the single twist is for hard wood, exactly the same as the Kreg Pocket hole screws.
steveo said:Same deal as always, 100 points to whoever can explain why these two have different designs.... why wood (pun intended) you prefer one over the other ?
Or why wood you use one and not the other ?
Beats me, maybe the historians will know.. who's in the know now?