Traxxas stock replacement stub axle carriers are constructed of black nylon. To prevent confusion, the axle carriers are stamped L and R. The rear axles ride in these. INCLUDES: Two axle carriers Assembly into Traxxas 4-TEC (Nitro or Electric) Suspension arm mount width: 14.4mm (.57") Bearing size hole: 11mm Height: 42mm (1.65") Toe in angle: 1.5°