SMART CRUSHER 2.50" Premium Quality Tobacco Herb Grinder (non-aluminum grinder). The metal alloy making up the SMART CRUSHER grinder is much stronger and superior Zinc and steel are forged together under extreme heat to produce the Premium quality metal 4 piece, 3 chamber design - 500 micron screen for pollen filtering 54 Diamond Shape Teeth for grinding which is superior to any other grinders. Dimension: 2.5 X 2.0 inch