Under cover bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Floor Pan Heat Shield to a mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Skid Plate to it's mounting point. Center. Floor Pan Heat. Powertrain Skid Plate. Under cover.