ITEM NAME:3: 1 Metal Reduction Planetary Gear for 1/10 RC Car Crawler Truck img *{margin:0;padding:0;.This planetary gear reduction unit is designed for slowing down the motors when torque is needed more than speed. It fits 540 motor and 1: 10 RC car. The included steel pinion goes onto your motor, then use your original pinion on the output shaft of this gear reduction unit.
