Correct option is C
Concept:
Tapping is the process of cutting internal threads in a pre-drilled hole using a tool called a tap. The tap cuts threads by gradually shearing the material to create the screw threads inside the hole. The process is commonly performed on machine tools such as drill presses or manually using a tap wrench.
Tapping Tools: Taps come in three types—taper tap, plug tap, and bottoming tap, used sequentially for precision threading.
Material Compatibility: Tapping is performed on metals like steel, aluminum, and brass, and sometimes on plastics.
Thread Type: Internal threads are made using taps, while external threads are cut using dies.
Pitch Control: The pitch of the thread (distance between crests) is determined by the tap specifications.
A reamer is a type of rotary cutting tool used in metalworking.
Precision reamers are designed to enlarge the size of a previously formed hole by a small amount but with a high degree of accuracy to leave smooth sides.
There are also non-precision reamers which are used for more basic enlargement of holes or for removing burrs.
