Human Grade Grinder 6M (2.5")The Human Grade 2. 5" (63mm) 4 Piece Grinder features a tighter, ergonomic curved body design that fits naturally in your hand for maximum comfort and control. Built for durability and precision, it delivers a smooth, consistent grind with ease. Retail Unit: One (1) Grinder Pieces: 4 (Four) An upper chamber, grinding chamber, pollen screen, and a bottom chamber for collecting the finer particles Size: 2. 5" (63mm) It's the perfect size to take with