Central Drive Shaft 111mm extended is made of world-renowned HUDY Spring metal and features 2.5mm drive pins for optimum drivetrain efficiency. The drive shafts are internationally's thinnest yet most durable drive shafts found in electric off-road automobiles. Hardened with a proprietary solidifying procedure, the drive shafts provide unbeatable lifespan and dependability. The safety collar on front driveshaft secures the pin, even though the ball bearing captures the pin in straight back axles, both preventing the pin from coming lose during a run Fits XB4'21