This Robinson Racing Products pinion gear features a 5mm bore, 0.8 module (31.75P) pitch, and 16 teeth, made to extra hard specification for increased wear resistance. It includes a set screw for secure motor shaft mounting. A factory replacement or upgrade option for electric RC vehicles running the standard 0.8 mod gear pitch. Features: 16-tooth pinion gear 5mm bore fits standard motor shafts 0.8 module / 32 pitch compatible Extra hard material for extended gear life Includes set screw 7/7/26 cs