SOLUTION

• Hand files typically feature double-cut teeth on their faces, which allows for efficient material removal.
• This design enables the file to cut in both directions, making it effective for various filing tasks.
• One edge of the hand file is usually a single cut, which provides finer control and is useful for achieving a smooth finish.
• The other edge is often referred to as a safe edge, designed to protect finished surfaces and prevent accidental damage while filing.
• The presence of the safe edge makes these files particularly useful for filing surfaces that are at right angles to already finished surfaces, allowing for precision work without compromising the quality of adjacent areas.