The HIOS electric torque screwdriver is designed with a powerful, high speed motor to increase productivity and efficiency. Ensures accuracy in fastening with precision automatic shut-off clutch once preset torque is achieved. Note! Requires a Transformer (power supply).Model:A4500Drive Size:4mm Hios Dr.Range: 40 - 80 cN.m ,3.5 - 7 lbf.in, 4 - 8 kgf.cm.Tool Weight:16 oz.Tool Length:7.75RPM High:1700RPM Low:1200Grip Dia:1 1/4"