This is a Tamiya TG10 Rear Wheel Axle. This fits TG-10 and TB-01 series chassis. COMMENTS: These fit the TG-10 series which is a 1/10 scale nitro chassis or the TB-01 series, which are the shaft driven electric sedan series. Examples of the TG-10 series would be the Mercedes Benz CLK or the Lancia Delta. The TB-01 series includes cars like the Subaru Impreza WRC.