1.0 LITER. Upper shield bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Exhaust Pipe Heat Shield to it's mounting point. Hardware to attach the Heat Shield to the catalytic converter. and Washer Assembly. and Washer Assembly - HEX. HEAD. Catalytic Converter Heat. Exhaust Heat. Inner.