Blue tone spice grinder is 4 piece plus has a small scraper. The top is magnetic and you pull off, add your spice, tobacco or tea, replace magnetic lid and twist back and forth. The third layer of the grinder screws off, it is a screen and the fourth layer is the cup that catches your ground item. The bottom also hold a scraper for easy cleaning. Please remove before using. The grinder itself measures approximately 1.5 inches in diameter and in height.