UNIQUE EASY OPEN/LOCKING FUNCTION | The ONGROK 4 Piece Grinder uses a quarter turn locking function, so it's easy to open and access your herbs. Don't worry about the main compartment of your metal grinder getting stuck. REMOVABLE SCREEN FOR EASY CLEANING | This large, handheld grinder contains a removable screen for easy cleaning. To remove the screen, just lift the handle and turn counter-clockwise. Use the 'catch chamber' as a storage compartment for on-the-go! PRODUCE THE PERFECT GRIND | This metal herb crusher is crafted out of solid, aircraft grade aluminum. Inside of the aesthetic finish, this grinder uses 33 triangular shaped teeth, to provide a medium-to-fine grind, every time. This is a reliable spice and herb grinder that you can count on. COMPACT AND PORTABLE | A 55mm (2.2 inch) diameter of this herb crusher, fits easily into a small bag making it the perfect on-the-go grinder!