Milling teeth also known as milling machine cutter head or planing teeth, from the specification is basically divided into φ 20mm and φ 22mm two, which is in accordance with the size of the bottom diameter of the cutter head to distinguish; Imported or domestic milling machine is in accordance with the two size configuration of the cutter head, which is to facilitate the user to replace the cutter head; However, the shape structure is much more complex, each company's shape is different, but as long as the two categories are distinguished, the other are basically common, there is no need to stick to one box in appearance, although each company is not the same in the design style of knife head, but the idea is basically the same; That is to ensure that milling machine tool head in milling operation, can be flexible rotation, and minimize the resistance of the tool head in the work, fast cutting pavement materials;