Drilling bit

Steel Body: Steel Body, forged by material 5140 or 4140 or any other appointed material, heat treatment with 40-44 HRC hardness, has high toughness and wearable and resistible character. Tungsten Carbide:  with the over 50HRChardness is made from low press sintered, and the suitable selected grade according to the target projects of Asphalt road & Cement concrete road, which to make sure the good performance during the working。