This 12mm alloy hex insert is an aftermarket accessory built for HPI Bullet Fluorescent MT and ST platform models. Supplied as a set of four, it adapts wheel-to-hub interfaces where a 12mm diameter and 9mm thickness hex seat are required.
Fitting is straightforward for anyone used to swapping wheels or hubs: remove the stock hex or hub, slide the alloy adapter into place on the wheel or axle hex, and secure with your existing hardware. Use the correct hex driver, perform a dry fit and check that the adapter sits flush before running the vehicle.
In setup and tuning the adapter lets you change the effective wheel interface without altering axle or gearbox parts, helping refine track width and wheel alignment where those dimensions match the model. Always verify clearance with brakes, suspension and body mounts during a test assembly.
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