Metal Grinder. Eclipse 5 part aluminum grinder. Each grinder is 50 mm or 2 inch in diameter. Each 5 part grinder is a solid premium grinder made from one piece of aircraft 6061 aluminum using CNC machines. They have sharp diamond shaped teeth to give you a nice clean grind. Good quality grinders that have been serving the industry for the past 20 years. Each grinder comes with two screens, one with the standard mesh screen and the other coarser screen. You can customize your blend using only one or by using both then your material will be sifted with a coarse grind first and then a finer grind through the 2nd screen. Durable, easy to use, and comfortably fitting in your hand, these premium grinders are everything that you could need to have a smooth smoking experience. Every 5 part metal grinder comes with a little scoop to scrape up the kief 🙂