Changes

====Round edged scalpels====

The copper tracks on the top layer of a PCB are usually covered with a layer of (green) solder mask, which can be carefully scraped away from the portions of the track that are about to be soldered to say attach a wire. The round shape of the blade #23 (there are other blades with a rounded edge) allows the user to only remove the solder mask from the track of interest, which will make the soldering process later on very easy, since the remaining solder mask will prevent the solder to stick to the covered tracks. Exposing the other tracks by scraping too much solder mask away may result in a much more difficult soldering job.