Nedz Whirlwind Power 3.5mm, 4.0mm or 4.5mm stroke

The comes in a choice of strokes 3.5mm,4.0mm and 4.5mm. Whirlwind is my first brushless power pen which give consistent torque at low volts. Running voltage start from 4 volts up to a super fast 12 volts but I recommend running around 6 volts which will give you about 4 hours from the integrated battery with a recharge time of 30-40 minutes, comes with a choice of 3.5mm, 4,0mm or 4.5mm stroke.