The year in which the first insert bit was introduced was?

• A. 1940
• B. 1949
• C. 1942
• D. 1950

Answer: (B)

The question is about when drill bits with replaceable cutting inserts first appeared. After World War II, advances in wear-resistant carbide inserts and reliable methods to mount them on bits made this concept practical. By 1949, manufacturers were actively offering bits with replaceable inserts, marking the initial introduction of the insert-bit design. That’s why 1949 is the best answer: it represents the moment the technology first reached the market. Earlier years didn’t have commercial insert-bit designs, while a later year would reflect adoption rather than the initial introduction.