This Robinson Racing Products pinion gear features 19 teeth cut to 32 pitch (0.8 mod) and fits a 5mm motor shaft. The blackened steel construction is heat-treated to an extra-hard specification for increased wear resistance compared to standard pinions. A set screw is included for securing the gear to the motor shaft. Features: 19 tooth, 32 pitch (0.8 mod) 5mm bore for motor shaft Extra-hard blackened steel construction Includes set screw 7/7/26 cs