Chinese Wholesaler and Top Quality Tungsten Carbide Thread
Chinese Wholesaler and top quality Tungsten carbide thread cross head drill bits for ore mining. Applications: The Drill Bits are made from grade hard alloy and special steel, generally matched with the lightduty rock drill, to drill the rock hole within diameter of 50mm. The drill tools are used in metallurgy mine, geological exploration, water conservancy construction, electricity, traffic, tunnel, quarry,