Central Drive Shaft 79mm very long is constructed of world-renowned HUDY Spring metal and features 2.5mm drive pins for optimum drivetrain effectiveness. The drive shafts are some worldwide s thinnest yet many durable drive shafts found in electric off-road automobiles. Hardened with a proprietary hardening procedure, the drive shafts provide unbeatable lifespan and dependability. The safety collar in the front side driveshaft secures the pin, even though the ball bearing captures the pin in back axles, both avoiding the pin from coming lose during a run Fits XB4'21