Plastic is often used to make accessories for inside micrometers and bore gauges. Wood is commonly used to make carrying cases.
- Carbide is harder than steel, making it more wear resistant and providing longer tool life. It is used on the tips of measuring faces on micrometers or to make contact points on bore gauges.
- Nickel is corrosion resistant and ferromagnetic, and is used on micrometers as a surface finish.
- Steel is a good general-purpose material and is rust resistant.