This is a portable coffee grinder from Cafflano♪ The cover is missing‼︎ It can grind coffee beans. To reduce fine particles, it's designed to "cut the beans" when grinding, and uses a conical burr from an Italian grinder manufacturer, widely used in commercial coffee machines. It allows for a wide range of grind sizes, from Turkish coffee and espresso (very fine) to French press (coarse). The grind size can be adjusted in 14 steps, from 3 to 8 on the first and second rotations. Thank you for your understanding.