The lathe tool shown as figure "N" in the illustration is commonly known as a/an __________. Illustration GS-0090

Correct Answer: Option D — knurling tool

A knurling tool is used on a lathe to impress a diamond or straight-line pattern onto a cylindrical workpiece. This process increases the surface area for better grip or provides a decorative finish, and it is a standard operation performed by machinists during routine shipboard metalwork and component fabrication.