The instrument has serrated teeth on its wheel that is attached to a handle that is about 6 inches long.
A knife is a tool or weapon with a blade or cutting edge attached to a handle or hilt, which is frequently affixed to a handle or hilt. The knife is one of humanity's first tools, dating back at least 2.5 million years, as demonstrated by the Oldowan tools. Knife blades were initially made of wood, bone, and stone (such as flint and obsidian), but because of developments in metallurgy and production, they are now made of copper, bronze, iron, steel, ceramic, and titanium. The majority of modern knives have fixed or folding blades; blade patterns and styles vary by maker and country of origin. Knives can be used for a variety of tasks. Scouts, campers, and hikers all carry pocket knives. Hunters use a hunting knife, soldiers use a combat knife, and scouts, campers, and hikers all carry pocket knives.
It has a handle and metal wheel with teeth used with tracing
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