CNC Machined from high-grade aluminum, these rear hub carriers feature a set-screw over hinge-pin design that securely keeps the hub carriers on the hinge-pins. This design also keeps the wear to a minimum by making the hinge-pins rotate in the arms, and not in the aluminum hub carriers. They also increase the durability and add awesome factory looks to your Slash 4x4. (Note: set screw in rear hub to be used with ST3640RS and ST3640RBK lock-nut style rear outter hinge-pins only. Setscrew is not used with kit type hinge-pins) These are zero degree hub carriers, with no additional toe-in.