The Cosmic Case Mini Bottle Cap Grinder is the only surgically clean, high quality aluminum grinder on the market. Sitting at only 1 5/8" diameter, the Cosmic Mini Grinder is one of the most premium grinders available; they are designed and engineered for perfection. The diamond sharp razor cuts fit perfectly between each other to grind up your herbs with easy. These feature a strong magnetic grip to keep the grinder closed. Grinding is a breeze, bringing literally zero resistance because of the razor sharp cuts.