It is extruder, cylinder and screw rods are made of quality alloy steel that have been nitrized and processed in a precision way. Hence it is sound in hardness, durable in corrosion resistance.
Spiral slicer drum grater is also named rotary vegetable grater. And this kind of items are popular for its ease of use. Besides, the item B351-A is with 3 separate style of grating.