Best selling 58KW blast hole drilling machine Hengwang down the hole hammer drill rig Separated dth drill rig price Power:191kw magic-41{margin-top:-1

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Best selling 58KW blast hole drilling machine Hengwang down the hole hammer drill rig Separated dth drill rig price Power:191kw magic-41{margin-top:-1Best selling 58KW blast hole drilling machine Hengwang down the hole hammer drill rig Separated dth drill rig price Product Description Click to get the latest price HW 420 is equipped with a dual motor rotary head and a multi way valve with adjustable rotary speed. The rotary torque can reach 2200N. m, which meets the needs of 76 drill pipes and 130 bores. The rotation speed can reach up to 150 revolutions, which meets the needs of some customers for