详细规格及用途描述 Square Drive : 1/2”. Voltage: 18 V d.c. Charging time: 1 hour Auto cut-off. No-load Speed: 0~1800 RPM ±10%. Tool Weight(Without Battery): 3.2 kg (2.18 kg). Max Tightening Torque: 5500 kg-cm (400 ft-lb).