Homegrown Grinder - 4 PIECE | Cali CrusherThe Cali Crusher Homegrown four piece grinder features our patented Four Way Quick Lock System which replaces traditional threads, eliminating the possibility of cross threading. This grinder also features an easily replaceable, 210 count micron screen that can be removed with a 3 32 inch hex wrench. Made using high quality 6061 aerospace aluminum. Designed with CAD Solid Works and produced with CNC precision engineering our grinders come with type II