Which tool is used for curve and flat filing?

The tool used for curve and flat filing is the half round file. This type of file features one flat side and one curved side, allowing it to effectively shape and smooth both flat and rounded surfaces. The flat side is ideal for filing flat surfaces, while the curved side is perfect for working on concave shapes or internal curves. By utilizing both sides, a half round file provides versatility and precision in various filing tasks, making it an essential tool for woodworkers, metalworkers, and anyone engaged in detailed craftsmanship where shaping materials is required. The other options do not possess the specific design or functionality needed for curve and flat filing, thus making the half round file the appropriate choice for this task.