Answer is:
Alloy steel
Explanation:
Alloy steel is used in manufacture of anvil for outside micrometer.
![Which material is used in manufacture of anvil for outside micrometer?](https://mcqfinder.in/uploads/images/objective-questions/turner-set-2-vernier-caliper-micrometer/turner-set-2-vernier-caliper-micrometer-id-5-e.jpg)