Lightnin Heavy Duty High Flow Mixer. Model: ND-4B. S/N: 687451. Gear driven for high output torque. The high torque is very effective in handling low-viscosity fluids. Internal gearing with a single-reduction of internal gears provides a more compact drive greater strength, quiet operation, and longer gear life. Positive chuck maximum propeller diameter: 7/8 in. Lightnin motor, 3 hp, 1,750 rpm, 350 rpm (final), 230/460 V, 8.2/4.1 amps, 60 Hz, 3 phase. Overall dimension: 12 in. L x 10 in. W x 27-1/2 in. H.