Question

the ________ file cleans clogged or distorted threads on bolts and studs.

o a. rough
o b. thread
o c. course bastard
o d. second cut

Explanation:

A thread file is specifically designed to clean clogged or distorted threads on bolts and studs. Rough files are for general rough - shaping, course bastard files are for heavy - duty material removal, and second cut files are for a smoother finish after the initial roughing.

Answer:

B. Thread