Heng rong clock hands use made of copper, aluminum material and plastic three kinds of material, the thickness of the metal clock needle pinhole is 0.4 to 1.0 mm respectively clock wash pipe and copper, the thickness of the plastic clock needle from 1.5 to 2.0 mm, which is widely used in metal clock needle is the thickness of 0.4 mm, 0.4 mm thickness in a normal clock can completely meet the requirements, long needle more than 0.5 mm thick material is not recommended because it will have a certain influence on movement of life and accuracy as well.Heng rong clock hands needle length measurement method from the center of the clock pinhole amount up until the clock pin the other end, rather than the whole a clock the length of the needle, because this method is according to the size of the clock dial radius can know what this clock with the length of the clock needle.

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