When you need to cut new external threads on a bolt, which of the following tools should you use? a.  a tap b. a die c. a diamond-point chisel  d. a hacksaw

B. A die

Explanation:

A die is an indispensable tool when working with screws, nails and nuts.

This is because a die is the tool that has a "mold" for a part that needs to be produced. When used, the die fixes strongly on a base that is inferred from the screw, forming a strictly rigid set and thus promoting the cutting of new external threads on a bolt.

answer; i believe the answer you're looking for is (nanotechnology);

the omega button is one of them.