The ServoCity 90 Tooth Hub-Mount Gear (MOD 0.8, 4mm Thick Acetal) is designed to integrate seamlessly with any MOD 0.8 gear, commonly pairing with a 30 tooth pinion or servo gear. This configuration enables a 3:1 underdrive or overdrive, enhancing torque and adjusting speed according to application needs. Constructed from durable acetal, it ensures reliable performance in various mechanical setups.