AKIRAKOKI Manual Wooden Coffee Grinder HIGH QUALITY WOOD pig iron top, solid wood body(carve from one piece of solid wood block, never going to crack), premium cast iron burr. DURABLE BURR Cast iron conical burrs don't produce the heat that can adversely affect your coffee's essential oils, and have no metal odor and will never rust. ADJUSTABLE GRINDING Use the screw under the grinder base to control the fineness of your coffee grinding. Coffee Bean Mill with Cast Iron Burr EASY AND QUIET GRIND The ergonomically designed Crank handle to provide effective leverage for a smooth and easy grind, and consistently eliminates noise.