The 20-tooth, 0.5 Mod Hardened Steel Pinion Gear features a 2.3 bore. Designed for durability and performance, this gear is ideal for use in various remote control applications. It is made from hardened steel, ensuring that it can withstand the rigors of high-speed operation and provide reliable functionality in your projects. Upgrade your model's drivetrain with this precisely engineered pinion gear to enhance its overall performance.