What type of hole does a round file enlarge?

• A. Square holes
• B. Round holes
• C. Hexagonal holes
• D. Oblong holes

Answer: (B)

A round file is specifically designed to enlarge and smooth out round holes. Its circular cross-section allows it to effectively fit inside and work on the contours of a round opening, enabling the file to remove material evenly from the wall of the hole. The shape of the file aligns perfectly with the geometry of round holes, facilitating precise adjustments and refinements without altering the shape into an undesirable form.

In comparison, other hole shapes, such as square, hexagonal, or oblong, would not be compatible with a round file's design. Utilizing a round file on these types of holes could lead to uneven surfaces or damage, as the file cannot adequately conform to those shapes. Thus, when the intent is to enlarge a round hole, a round file is the ideal tool due to its specific shape and functionality.