This is a 27 tooth (0.6M) Pinion Gear for the HPI E10 series on-road cars. FEATURES: Precision made Stamped for easy identification YOU WILL RECEIVE: One 27T 0.6 pitch Pinion Gear One 3x3mm set screw REQUIREMENTS: Installation SPECIFICATIONS: Length: 10.5mm Inside Diameter: 3.2mm Outside Diameter: 17.3mm COMMENTS: Not compatible with 48 and 64 pitch spur gears cnh 5/13/08 ir/jxs &