GET THE PERFECT GRIND - Masterdam's Razor Sharp Curved Teeth Shred & Fluff your Herb with Ease, while precisely sized hole pattern ensures a consistent, perfect grind. You will LOVE using this grinder! PRECISION MILLED AEROSPACE-GRADE ALUMINUM - Scratch Resistant, Hard Anodized Aluminum ensures long-lasting durability; Non-Stick Nylon Ring ensures smooth grinding and prevents metal-on-metal contact and residue build-up. Avoid inferior zinc-alloy grinders. MAGNETIC LID & THREADED CHAMBERS - Powerful Neodymium magnets in the lid enable quick loading and secures your herbs when grinding; while the threaded lower chambers prevent spillage and keep your ground herb contained until ready. MICRON SCREEN AND MINI-SCRAPER - A micron screen catches ultra fine grinds in the third chamber and the mini-scraper tool is included for cleaning and to ensure nothing is left behind.