Motor pinion 18 teeth M 0.8 steel hardened 500013408 robust and wear-resistant motor pinion made of hardened steel including grub screw for fixing on the engine shaft. Teeth: 18 Z module: 0.8 module 0.4 sprocket fits for formula/TA03/TA04/TB01 Tamiya chassis. Module 0.6 sprockets fit TT-01/TT-01 Type E/TT-02 and other Tamiya standard chassis. Module 0.8 sprocket fits for Tamiya off-road chassis. Attention: always observe manufacturer instructions for the specific module specifications. Warning: not suitable for children under 14 years.