The HIOS VB-Series brushless electric screwdriver is designed to plug directly into a power outlet and does not require a separate power supply unit. Features a high performance brushless motor design provides durability and reduces the standard maintenance costs for electric screwdrivers. Operates on a duty cycle of 0.5 seconds on and 3.5 seconds off.Model:VB1510Drive Size:1/4" F/HexRange: 25 - 150 cN.m ,2.2 - 13 lbf.in, 2.5 - 15 kgf.cm.Tool Weight:18.6 oz.Tool Length:10RPM:970Grip Dia:1 1/2"110V