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_17918238_1 (length VARCHAR, maximum_diameter VARCHAR)

### Question ###
What is the length for a diameter totaling 450 mm?

### Accurate SQL ###

SELECT length FROM table_17918238_1 WHERE maximum_diameter = "450 mm"