Our company uses "sun" as a unit of size. For example, a "3 sun" hook is approximately 90 mm long. This 90 mm is the total length of the hook body measured before bending. Other companies' fishing hook products are labeled as No. 24, No. 20, etc., but No. 20 does not necessarily equal 2.0 sun. Sometimes they are the same, but sometimes they are different.
