Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_14 (licence_number VARCHAR, maximum_diameter VARCHAR)
### Question:
What is the license number where the maximum diameter is 400 mm?
### Answer:
SELECT licence_number FROM table_name_14 WHERE maximum_diameter = "400 mm"