The most used grades of files, as recommended by BIS, include:

The most used grades of files, as recommended by BIS, include:

Right Answer is:

Bastard, second cut, smooth, dead smooth

SOLUTION

According to the Bureau of Indian Standards (BIS), these four grades are recommended for engineering files.

  1. Bastard File: Used for heavy material removal.
  2. Second Cut File: Ideal for achieving a good finish after initial shaping.
  3. Smooth File: Designed to remove small quantities of material and provide a good finish.
  4. Dead Smooth File: Used for achieving a high degree of finish and precise sizing.
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