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H22 H25 Hex22 Hex25 Hexagon 108mm 159mm Shank 6 7 11 12 Taper Degree Tapered Conical Integral Rock Drill Steel, Find Details and Price about H22 Drill Steel H25 Drill Steel from H22 H25 Hex22 Hex25 Hexagon 108mm 159mm Shank 6 7 11 12 Taper Degree Tapered Conical Integral Rock Drill Steel - Xiamen Sansung Mining Equipment Co., Ltd.