A reamer is a precision cutting tool used in machining and metalworking operations to create smooth and accurately sized holes in a workpiece. Unlike drills, which remove material in a single operation, reamers are designed to refine and improve the accuracy of existing holes. Reamers typically feature multiple cutting edges along their cylindrical body and are available in various types, including hand reamers, machine reamers, and adjustable reamers. They come in different shapes and sizes to accommodate specific hole diameters and geometries. Reamers are commonly used in industries such as automotive, aerospace, and manufacturing, where precise hole tolerances are essential for proper assembly and functionality of components.