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!