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_46 (length VARCHAR, barrel_length VARCHAR)
### Question:
What is Length, when Barrel Length is 750mm / 29.5 in?
### Answer:
SELECT length FROM table_name_46 WHERE barrel_length = "750mm / 29.5 in"