Striped design for increase the friction. Anti-slipping plastic cover - It doesn't slip when you twist coffee grinder cover. And made of 160ml detachable and large capacity glass bowl. The size is 6.5 x 2.8 x 2.6 inches. The gears grind smoothly making it easy to use. The burr of our manual coffee grinder can be adjusted from ultra fine to coarse as you like.The ceramic burr and the hand crank are durable and sturdy Coffee grinders are made of glass, stainless steel and plastic .The ergonomic design handle perfectly fits in the palm of your hand The manual coffee grinder's Professional ceramic burr will not burn your coffee beans and makes the grinding process more detailed and the coffee powder more uniform This manual coffee machine not only uses mellow coffee, but also grains can easily be used,You can also grind dry things such as tablets.It is easy to take it apart and assemble again and also easy to clean