What tool is best suited for shaping and filing wood surfaces?

The half round file is best suited for shaping and filing wood surfaces due to its design, which features a flat side and a rounded side. This allows the user to access both flat and curved areas of the wood, making it versatile for various shaping tasks. The teeth of the file cut into the wood, smoothing rough edges and ensuring a precise finish.

In contrast, the half hatchet is primarily a cutting tool, used for chopping or trimming rather than fine shaping. A grease gun serves a completely different purpose related to lubrication, which does not apply to woodworking. The hand screw clamp is used to hold materials in place but does not help in shaping or filing. Thus, the half round file is clearly the most appropriate choice for the task at hand.