Features 1、This gear reduction will increase the torsion at the hub gear to 2x what the servo produces 2、Transfer the torsion of your servo into a gear train with these MOD 0.8 servo gears 3、This 40 tooth servo gear is most commonly used to drive the 80 tooth hub gear, spaced 48mm away, in order to create a 2:1 ratio 4、Good‑quality brass material with excellent ductility and corrosion resistance 5、Spur gear have stable structure, excellent performance and long service life Specification Item Type: Spur Gear Product Material: Brass Product Model: 4305-0025-0040 Pitch Diameter: Approx. 32mm / 1.3in Outer Diameter: Approx. 33.6mm / 1.3in Diameter: Approx. 3mm / 0.1in Size: Approx. 6mm / 0.2in Package List 1 x Spur Gear