When it comes to racing safety equipment, no compromises should be accepted. RaceQuip offers various hardware pieces for auto racing seat belt and harness installation. All RaceQuip hardware is forged from premium quality SAE 1050 steel, then cadmium plated for corrosion resistance. The RaceQuip Harness Mount Back-Up Plate is used when mounting racing harnesses or seat belts in a production car with a sheet metal floor, or anywhere that extra reinforcement is needed. This 4" x 4" steel backup plate is 1/8" thick and has a 7/16" bolt hole pre-drilled in the center.