what's the width with frame size being 4.5k
CREATE TABLE table_1251878_1 (
    width VARCHAR,
    frame_size VARCHAR
)
SELECT width FROM table_1251878_1 WHERE frame_size = "4.5K"
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's the width with frame size being 4.5k ### Input: CREATE TABLE table_1251878_1 (
    width VARCHAR,
    frame_size VARCHAR
) ### Response: SELECT width FROM table_1251878_1 WHERE frame_size = "4.5K"