High-strength split one-piece machined 2-gear 14/18T pinion gear module from tough 7075 T6 aluminum and specially difficult coated for superior power, light-weight, and high durability. Developed on a specific gear unit, all pinions work ultra-precise enamel shaping and ultra-true operating for vibration-free procedure. Fine inside threading permits effortless installation. Each pinion is fine etched using the enamel volume for fast & simple recognition.