Product name::Hand-crank coffee grinderProduct size: 4.8*18.5cmMaterial: stainless steel 304/PP/ceramic grinding core, plastic spray treatmentPERFECT ADJUSTABLE SETTINGS: The manual coffee grinder can be adjusted in 3 steps of coarse, medium and fine by turning the adjustment wheel, clockwise for fine and counter-clockwise for coarse. When turning, make sure there are no obstacles between the inner and outer burrs to adjust the bag wheel. This is very important when going from coarse to fine. Keep the beans dry before grinding.The portable mini with ceramic adjustable knob is easy to use and clean. Manual coffee grinders can be cleaned with a brush or running water. Easy to disassemble for cleaning. After cleaning, allow the parts to air dry before reassembling them.