If you have to cut many slices of bread and have them all look uniform, a knife can be insufficient, regardless of how well you handle knives. Cutting with a bread knife can also create a lot of mess and food wastage. A commercial bread slicer will ensure that every slice is cut to the desired width every time. Some are adjustable for thinner or thicker slices. Many also have underneath trays to catch any crumbs and prevent mess.