This is a 12 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 12 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. cmc 7/9/01 ir/kh BOX DIMENSIONS: 2.50" W. X .50" H. X 3.00" L. BOX WEIGHT: .02 LBS.