These black 4mm hex posts are compact spare mounting components intended for Tamiya Mini 4WD platforms. They provide a firm 4mm hex interface used to locate rollers, stabiliser arms, and bumper brackets on standard Mini 4WD chassis, offering a neat and repeatable mounting datum for detailed setups.
Builders should verify post diameter and thread engagement with their chosen rollers and reinforcement plates prior to assembly. These parts are designed as service replacements that prioritise fit and consistent interface geometry rather than dynamic performance gains.
Recommended for competitive hobbyists requiring reliable spare mounting hardware for quick repairs or precise cosmetic builds where consistent hex engagement matters.