Large 4-Piece is 2.4" (62mm) in diameter. 57 trapezoid-shaped teeth each feature four cutting edges to evenly shred your material into an airy, multi-use grind that falls freely through thoughtfully designed drop-through holes into the chamber below. The proprietary ceramic coating on all surfaces inside and out means no more sticking , no more grinding to a halt 100% non-toxic, FDA-approved ceramic coating - ZERO Teflon ® or PTFE Ideal grind for rolling up or packing into glass for a smooth, even burn every time Popular 4-piece design is perfect for pollen collection and storage of ground materials. The easily removable screen gives you options for how many chambers you utilize - options are good! Just ONE set of threads! Machined to the thousandth of an inch and then treated with our unrivaled ceramic coating, you'll never deal with gummy, difficult, mangled threads again when you make the switch to SLX Comfort-designed grips are not only aesthetically pleasing but are also ergonomically efficient even for users with compromised or weakened grip strength Rare Earth magnet enclosure keeps your grinder closed tight in your backpack, pocket, or purse, but opens easily when it's time to grind! This product is intended to be used with legal smoking materials only. Smoking may be harmful to your health. This product may not be sold to minors.