I bought these years ago and forgot. I rediscovered them in my tool box and used them in the motor starter panel assembly. These little exercises are great. It's a shame I didn't start it sooner. I used 8-32 to drill and cut holes for the hinges and 10-32 to mount the motor starter to the panel. They worked flawlessly and saved a lot of time fumbling around with a tap, a wrench and finding the right bit size. I noticed that other brands are cheaper. I can't say if they are better than the others because I haven't tried them. I know that Champion carbide burs are superior to other brands. Maybe there is a difference between drills and taps.