4-part grinders are more advanced grinders, it takes less effort to crush your herbals compare to 2-part grinders. It has a lid and another and lower grinding plate. There will always be small holes inside the lower grinding plate amongst the teeth to vacate the ground herbs. In the middle section is a fine-wired mesh screen for catching and holding your grind.
The smallest particles of the pollen fall down through the screen into a lower storage chamber, which is the fourth and final piece of the grinder.

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