This is a 14 Tooth 32 Pitch Pinion Gear for the Traxxas E-Maxx Truck. This is the gear which is attached directly to the motor.                                                                                            FEATURES: Machined Steel                                                                       Designed for a 3mm shaft                                                                                                                              INCLUDES: One 14 tooth Pinion Gear                                                             One 3 x 4mm Set Screw                                                                                                                                 REQUIRES: Assembly onto an E-Maxx truck.                                                       1.5mm hex wrench to tighten set screw.                                                                                                                COMMENTS: This gear is only one of two which are used on the E-Maxx dual motor set-up.