Hot Racing 34T Mod-1 Pinion Gear for use on 1/8 Scale Cars. FEATURES: Hardened steel constructionBlack in colorYOU WILL RECEIVE: One 34T Mod-1 Pinion GearOne 5x5mm Set ScrewREQUIREMENTS: Installation on the vehicleSPECIFICATIONS: length: 12mm (0.47")Inner diameter: 5mm (0.20")Number of Teeth: 34 Gear Pitch: MOD1 Hole Diameter (Bore): 5mmCOMMENTS: Some car or truck might need modification to fit