Description: The high-speed gearbox can be assembled in 11.6:1 and 18:1 gear ratios. This high-efficiency gearbox is therefore suited for very fast vehicles or other fast mechanisms that do not require high torque. The low-voltage motors in the worm gearbox run on 1.5-4.5 volts and draw up to a few amps. This gearbox has a 4 mm diameter, round output shaft.