This two piece grinder is made with American milled aircraft grade aluminum and is anodized for increased strength. It is made with diamond teeth and outer edges wedges to push herbs back to the center of the grinder for a constant movement until you have achieved your desired texture.
There is a magnet for closure that makes it easier to open and close your grinder when you want to. Even though it is a magnet you'll never have to worry about it opening up on you and spilling. The magnet makes it easier to do a bi-directional twist to get the best texture.