Yep, it's a good idea to have a spare bit around in case you drill into a nail or screw or something and dulI the one you are using in the middle of a job. I usually just get the Mini Kreg Jig Kit. Comes with the bit, collar, wrench, and the Mini Jig as well for about a dollar more than the bit alone. Of course this means I have spare Mini Jigs around but it makes it easy to find one when I need it. I also keep spare bit drivers on hand, they do wear out.