Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_45 ( height__m_ INTEGER, peak VARCHAR, class VARCHAR, prom__m_ VARCHAR )

### Question ###
What is the average height for hewitt class, with prom less than 86, and a Peak of gragareth?

### Accurate SQL ###

SELECT AVG(height__m_) FROM table_name_45 WHERE class = "hewitt" AND prom__m_ < 86 AND peak = "gragareth"