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Robinson Racing extra-hard high carbon brushless motor pinion gears are built to work with our high-performance GEN3 steel slipper units. All opinions are precision machined and stamped with a specific number of teeth on each. One 4mm set screw is included with each pinion gear. A 2mm allen wrench (not included) will fit the 4mm set screw. These pinion gears can be run on vehicles using a 5mm motor shaft including Traxxas, Associated, and HPI models.