The HIOS VZ-Series electric screwdriver is designed to plug directly into a power outlet and does not require a separate power supply unit. Ensures accuracy in fastening with precision automatic shut-off clutch once preset torque is achieved. Operates on a duty cycle of 0.5 seconds on and 3.5 seconds off.Model:VZ1820PSDrive Size:1/4" F/HexRange: 40 - 180 cN.m ,3.5 - 16 lbf.in, 4 - 18 kgf.cm.Tool Weight:24 oz.Tool Length:11RPM:2000Grip Dia:1 1/2"110V