Central Drive Shaft 111mm extended consists of world-renowned HUDY Spring metal and features 2.5mm drive pins for optimum drivetrain effectiveness. The drive shafts are internationally's thinnest yet many durable drive shafts present electric off road cars. Hardened with a proprietary solidifying procedure, the drive shafts offer unbeatable lifespan and reliability. The security collar on front driveshaft secures the pin, even though the ball bearing captures the pin in back axles, both preventing the pin from coming lose during a run Fits XB4'21