1.PDC anchor drill bits 2.High abrasion resistance ,high impact resistance, ... .bit diameter:27,28,32,42 PDC anchor shank drill bits are mainly used for the coal seam, dam ... times of tungsten carbide bits. Usually the anchor shank drill bits have 2 or 3 wings.LD adopt high ... cutters and advanced brazing technology, so the anchor shank drill bits have high impact resistance and stable performance, can ...