The utility knife fills the gap between the paring knife and the chef's knife, with a blade height of 25–35mm. It is also the shape most often sold in block sets at compromised quality: the block-set utility knife is frequently the weakest piece. A good 150mm utility knife is a genuinely useful tool, but budget versions are often not worth carrying. The closest Japanese counterpart is the petty, which covers much the same range with a finer tip.
Primary tasks: slicing cold cuts, cheese, and sandwiches; trimming fruit; smaller prep tasks where the chef's knife feels oversized.
Limitations: this is the most optional knife in the typical set, since most of its tasks are better done by either a paring knife or a chef's knife. It is most useful for cooks working on small cutting boards, where a full-size chef's knife is awkward.