• Power supply:21v 4.0Ah
• Motor type:brushless motor
• No-load speed:2400rpm
• Tightening torque:350N.m 550N.m 712N.m
• Square head size:1/2”

Thickened aluminum alloy head shell,strong and durable,1/2 tungsten steel shaft,harder and more durable.Infinitely variable speed switch,more stable job speed regulation.Large-capacity battery pack,4.0Ah for longer battery life.Brushless motoe with higher torque and longer life.

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