Central Drive Shaft 79mm long is made of world-renowned HUDY Spring metal and features 2.5mm drive pins for optimum drivetrain efficiency. The drive shafts are some worldwide s thinnest yet many durable drive shafts utilized in electric off-road vehicles. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and dependability. The security collar in the front driveshaft secures the pin, although the ball bearing captures the pin in back axles, both steering clear of the pin from coming lose during a run Fits XB4'21