Space Case grinders are individually machined out of a single piece of air craft grade aluminum and invisibly seamed for a smooth turning movement. The high grade material these grinders are made of will ensure use for years to come. You can put the Space Case to the test as its diamond shaped teeth can shred any herb easily. In addition, the magnetic lid will keep the lid on to optimize your grinding movement and ensure the grinder stays closed when not in use. This medium size two piece grinder is about two inches in diameter and is the perfect size for grinding up your favorite herbs.