... rodrock drilling rods1.ShankHex:19mm*83/108mm,22m*83/108mm,25mm*108/159mm2.Taper degree:4.46 6 7 11 12 ... :0.4m-6mShank Hex:19mm*83/108mm, 22m*83/108mm, 25mm*108/159mmTaper degree:4.46 6 7 11 12Drilling rod ... 120.8m-6.0m108mm,159mm/ tapered drill rods(Hex:19~25mm)