This brass mortar and pestle measures to be 2 3/4 inches by 2 3/4 inches.
I started carrying these many years ago in my physical store because I would have customers come in and explain that they needed something to help their elderly parent to take pills. They would use the mortar and pestle to help crush the pill making it easier for the elderly parent to take their medication.
It is also good to use for grinding herbs. I would not recommend trying to crush roots or bark with the one because it is small and light weight.
I have never known someone who works with herbs to not have a mortar and pestle. They are usually used a lot to enchant herbs when you are getting ready to do a ritual for healing or protection.