Cast - Please kindly wipe it with a damp cloth or use a brush for cleaning. Dry parts thoroughly and then apply oil to to avoid rust. Small Grain Mill with Plastic Hopper - Suitable for small amount household grinding seeds and other seeds, spices, grains. Hand Crank Operation - You can enjoy the fun of grinding through hand cranked operating. It doesn't grind faster. If the finished powder is rough after the first time grinding, please try to repeat grinding . For better packaging, the handle is installed backwards. So please switch it around before first use. Easy to Clean - Our manual grain grinder is detachable for quick and easy clean-up. Attentions - Hand grinder CAN NOT completely grind materials into powder state, just crush them, it be a mixture of particles and powder. Materials larger than soybeans are not easy to grind.