These small scalloped knives are labelled as tomato knives as they are made precisely for cutting through fruits and vegetables with hard to break through skin. Most obviously tomatoes, but also kiwis, plums, grapes etc. These knives work really well when the center of the fruit is really soft or watery, where putting pressure on the fruit as you cut through could cause an explosion of its contents everywhere! Having a serrated knife will make things a bit easier. The blade is quite short, so these knives are not really useful for bread.