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Which of the following files is used for filing narrow grooves and angles above 10°?
Question

Which of the following files is used for filing narrow grooves and angles above 10°?

A.

Half round file

B.

Triangular file

C.

Square file

D.

Knife-edge file

Correct option is D

A knife-edge file is specifically designed for working in very narrow grooves, slots, and acute angles. Its cross-section tapers to a thin edge, resembling a knife, which allows it to easily enter tight spaces where other files cannot reach. This makes it highly suitable for filing narrow grooves and angles greater than about 10°, especially when precision work is required.

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