As noted in several reviews, the lapping tip is not perfectly aligned with the center of the drill shank. Having written this, I should point out that it doesn't seem to matter. I tested several bits with a drill press and a clamped piece of softwood. At the bottom of the fairly clean hole, there was a precise conical indentation from the needle tip, so it doesn't differ much. The bits did not appreciably tear open the surface grit, certainly not in the same way as pilot bits designed for metal. , the hole was easily made and clean inside. Here, too, there is no detachment of surface grains. The resulting hole from multiple test drills was about 1/64 inch larger than the drill's nominal diameter, which is about what I find with other drills and doesn't really matter for my woodworking. If I start to worry about 1/64th of an inch, it's time to get a prescription for Valium. UPDATE: I'm afraid I was a bit optimistic in my original review. Firmly clamped to a drill, these bits work adequately, but in a hand drill or even when not clamped to a drill, they exhibit an off-center shank tip that shakes the woodwork severely, and an uneven hole. So they work well under the right circumstances and not so well under all other conditions.