RaceQuip offers various hardware pieces for auto racing seat belt and racecar harness installation. This 4″ x 4″ steel backup plate is 1/8″ thick and has a 7/16″ bolt hole pre drilled in the center. This plate is necessary whan mounting racing harnesses or seat belts in a production car with a sheet metal floor, or anywhere that extra reinforcement is needed. Works well with RaceQuip 700060 long eyebolt kit. Sold each.