Spotweld Drill 3/8" Pro
Product Review (submitted on May 6, 2013):
The tool was nicely made, but requires too much force to use with a hand drill. I'm sure it would work fine with a magnetic base drill press or in a vertical mill. The other problem is that the centering point drills through the underlaying sheet that you are trying to save. I ended up drilling a 3/16 pilot and then using a step drill.