# How can I get the length unit name of STEP model?

 1. [FAQ](/faq)
2. »
3. [STEP](/faq/step)

The values of unit names can be accessed from OdAPFile instance (which is a database for STEP model) using OdDAI::OdUnitConverter class:

```plaintext
OdAPFilePtr pAPFile = pDatabase;
OdDAI::OdUnitConverterPtr unitConverter = pDatabase->getUnitConverter();

OdAnsiString unitName, unitPrefix;
unitConverter->getConversionUnitName("length_unit", unitName, unitPrefix); // "METRE", "MILLI"
```