This Robinson Racing Products pinion gear features a 16-tooth, 32-pitch profile designed for 5mm motor shafts. It is machined from blackened steel with an extra-hard treatment for increased wear resistance compared to standard steel pinions. A set screw is included for securing the gear to the motor shaft. This is a direct factory replacement pinion for a wide range of popular 32-pitch drivetrain setups. Features: Extra-hard blackened steel construction 32 pitch (0.8 Mod) tooth profile 16-tooth count 5mm motor shaft bore Includes set screw 7/7/26 cs