... rods,blast hole drill rods,geologic drill rod 1)Drilling rod length:0.4m-6m 2)Shank Size:83mm,108mm tapered drill rods ... /blast hole drill rods/geologic drill roddrill rodrock drilling rods1.ShankHex:19mm ... 6 7 11 120.8m-6.0m108mm,159mm/ tapered drill rods(Hex:19~25mm)