Aluminium 4 Part Herb Grinder 50mm Great value, great gind 4 Chambers including lid, grinder, and crystal catcher. Anodized metal for long lasting colour. Easy to use and great value. What Forbidden Fruitz say: As far as price goes, this aluminium grinder is second to none. Catch your crystals and save them for a rainy day or take the mesh crystalcatcher out to enjoy the full works with every roll. Easy to clean and easy to use too.