The Japanese petty knife is similar to western paring knives and utility knives. Recently, with Japanese knives trending worldwide, many chefs and home cooks have come to think of the petty knife as the best utility knife for small cutting tasks.
The reason why many chefs are beginning to favor Japanese petty knives over western utility knives, is because petty knives are made with Japanese steel, by expert Japanese knife makers. Japanese carbon steels and high carbon stainless steels tend to be harder, thinner, and sharper than western steels.
Petty knife blades range in size from around 80mm to 150mm, so you're sure to find one perfect for your needs. They're great for peeling, slicing, dicing, and especially good at intricate cutting work.