HPI Savage 17mm Hex Hub Conversion Set with UV Joint for the HPI Hellfire and Savage. Constructed of high strength steel, hard chromed for a shiny durable finish that is easy to clean. Fully re-buildable to add extra life when it comes time for maintenance These universal joints are factory designed, factory manufactured and team tested for the best fit and durability on the market. 17mm hex hubs decrease the stress on the wheels, helping to prevent stripped wheels when using high horsepower engines Universal joints deliver improved durability and more efficiency than the stock dog-bones. This product includes (4) 17mm Hex Hub Adapter. (4) UV drive. (4) Axles. (1) Heavy Duty Grease Tube. (1) Thread Lock Tube. (4) Pin 3.0x17mm. (4) Wheel Nut M8. (4) Set Screw M4x4mm. (4) Set Screw M5x4mm. (2) Allen Wrenches. (1) Instruction Sheet.