Engineering & Construction Machinery PartsChina 42mm Yk05 Gradetungsten Carbide Tapered Cross Rock Drill Jack Hammer Bit for Rock Drilling, Find details about China Carbide Tungsten Cross Drilling Bit, Forging Taper Cross Bit from 42mm Yk05 Gradetungsten Carbide Tapered Cross Rock Drill Jack Hammer Bit for Rock Drilling