Central Drive Shaft 79mm very long is constructed from world-renowned HUDY Spring metal and features 2.5mm drive pins for maximum drivetrain effectiveness. The drive shafts are some of the world s thinnest yet many durable drive shafts utilized in electric off-road vehicles. Hardened with a proprietary solidifying procedure, the drive shafts offer unbeatable lifespan and reliability. The security collar on the front driveshaft secures the pin, although the ball bearing captures the pin in back axles, both avoiding the pin from coming lose during a run Fits XB4'21