Milling bits, are also called milling machine cutter(s?), road milling bits, gear teeth, or pavement road teeth, or milling cutters, etc., It isThey are one of the main accessories of pavement milling planers. A , milling planer is used forof cutting ( the head) and the ground contacts for various operations. Basically it comes in two sizes: 20 mm and 22 mm. The size is distinguished, it is according to the size of the bottom diameter of the cutting tools.