DragRace Concepts 1/10th Scale Clamping Hubs. Package includes two black hubs and hardware, and are compatible with DRC1 and Redline funny car, dragster, pro stock and pro mod models. These hubs use a standard 4 bolt hole wheel mounting pattern and have spur gear mounting holes on the backside of the hub. These hubs are universal and fit 1/4" diameter rear axles.