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_8 (bore VARCHAR, designation VARCHAR)
### Question:
What is the bore of the boat howitzers with a 12-pdr heavy designation?
### Answer:
SELECT bore FROM table_name_8 WHERE designation = "12-pdr heavy"