Question: what is the difference between a size 2 and 2/0 hook?
Answer: As defined in aughts, the higher the number, the larger the hook. A 1/0 hook is bigger than a size 1. ... Therefore, a 6/0 hook is larger than a 2/0, but a plain 6 is smaller than a 2. Hooks are also made from various wire gauges or thickness.