This HPI pinion gear features 11 teeth with a 0.4 module tooth pitch and a 2mm bore, designed for use with small-scale electric HPI vehicles. The metal construction and set screw included with the gear allow for secure mounting to the motor shaft. It is a factory replacement part suited for hobbyists maintaining or adjusting their gear ratio. Features: 11 tooth count 0.4 module tooth pitch 2mm bore diameter Includes set screw 7/7/26 cs