This disc mounts to the wheel hub and provides the friction surface that the brake pads clamp against to slow or stop the truck. It is a replacement sold individually rather than as part of a set. It falls under the transfer case hardware, fasteners and fittings category for cab and chassis applications.FeaturesPart number: CCD-9673Category: Transfer case hardware, fasteners and fittingsSold individually (each)Tech SpecsUnit of Measure: Each