Original Name / Part No.: ARA310941+ARA310942Part location: Center transmission dogbone areaProduct major functions & usage: Smooth transmission of power.Accessories:Long Dogbone 1pcShort Dogbone 1pcMajor advantages of upgrading to this part/product:1. Made by harden steel #45 for stronger use and smooth driving performance.2. Thicker design upgraded from original dogbone 5mm diameter to 6mm diameter makes the movement of turn more powerful and not easy to break.