What is the bore of the boat howitzers with a 12-pdr heavy designation?
CREATE TABLE table_35344 (
    "Designation" text,
    "Bore" text,
    "Weight" text,
    "Service Charge" text,
    "Range (yards)" text,
    "Number Made" real
)
SELECT "Bore" FROM table_35344 WHERE "Designation" = '12-pdr heavy'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the bore of the boat howitzers with a 12-pdr heavy designation? ### Input: CREATE TABLE table_35344 (
    "Designation" text,
    "Bore" text,
    "Weight" text,
    "Service Charge" text,
    "Range (yards)" text,
    "Number Made" real
) ### Response: SELECT "Bore" FROM table_35344 WHERE "Designation" = '12-pdr heavy'