Are the specifications of the fishing rod heads of the same brand the same?

Different brands and the same fishing rod may be the same. Take the fishing rod as an example. Usually the specifications of 3.6/4.5/5.4/6.3/7.2 are universal. Unconventional specifications such as 3.9/4.8 are not universal with the above conventional specifications. Of course, the design of each fishing rod is different. For example, fishing rods with large cross-sectional designs (e.g., 5.4 meters and 5 cross-sections instead of the traditional 6 cross-sections) cannot be interchanged even with traditional specifications.

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