I keep this set in my cordless drill case for small jobs and it comes very handy for those jobs. The drills have a special tip that cannot be reproduced if you sharpen them by hand or use the DrillDoctor. I've only used them in one tree and they work very well. I understand that if I use them on steel they will soon dull and I can't sharpen the point head to original specs, so I only use them on wood, plastic and soft metals. Made in Taiwan.