High-performance ratchet mechanism with ceramic stone grinder. High-performance ceramic grinding stone. Adjustable for coarse or fine grinding. Ergonomic ratchet handle. Easy to fill; open front door and add spice. BPA-free materials. To Fill: Open front door. Add salt, pepper or spices. To Adjust Grind: Turn bottom knob clockwise for FINE and counter-clockwise for COARSE. To Grind: Move ratchet handle back and forth. Tips and Uses: Avoid dampness; do not grind over boiling pot. Do not use cloves or anise, as oils will destroy plastic.