Human Grade Grinder 5T (2.5")The Human Grade 2. 5" (63mm) 4 Piece Grinder is built with tighter sealing rings to lock in freshness and prevent spills, while its notched design ensures a secure, comfortable grip. Durable and precise, its engineered for a smooth, consistent grind every time. 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