This is an optional GH Racing 14mm Hex Wheel Hub Set for the Traxxas T-Maxx, E-Maxx, and Revo.FEATURES: Aluminum construction, anodized blue in color Replaces stock plastic hexesINCLUDES: Four 14mm Hex Wheel HubsREQUIRES: Installation on vehicleSPECS: Hex size: 14mm (0.55") Thickness: 6mm (0.24")Golden HorizonsPart GHH02525