Mixer is gear driven with 3 speeds. The gears are contstant mesh heat treated alloy steel. #12 Size hub. Electrical: 110 V / 60Hz. 1.0 H.P. A hardened steel worm and alloy bronze worm gear transmits power to motor transmission. Equipped with Safety Guard and an overload switch. 20 QT. Capacity Included with the Mixer: Stainless Steel Bowl, Flat Beater, Stainless Steel Wire Whip & Dough Hook.