Mixer is gear driven with 3 speeds. The gears are contstant mesh heat treated alloy steel. #12 Size hub. 1/2 H.P. Electrical: 110 V / 60Hz. A hardened steel worm and alloy bronze worm gear transmits power to motor transmission. Equipped with Safety Guard. 10 QT Capacity Included with the Mixer: Stainless Steel Bowl, Flat Beater, Wire Whip & Dough Hook.