Have not had luck sharpening them. We work mostly in softwoods. Gabel's right - it's the short spurs that make them hard to sharpen. A big difference in the style between the two is the amount of metal that is in contact with the wall of the hole. Look at the difference in the thickness of the auger portion. I think that makes the Irwin easier to "steer". It's up to you to decide if that is a good thing, or a bad thing. CB.
Last edited by daiku; 09/29/11 01:00 PM.
