Horn bolt. A bolt used to secure the hybrid / electric sound alert speaker bracket to the vehicle or the speaker to the bracket. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Hood Support Strut Holder to it's mounting point. Anti-Theft Alarm Siren Bolt. Horn Mount Bolt. Mount. WINDSHIELD WASHER. Anti - Theft Alarm Siren. High note. Hood Lift Support Stud. Hybrid / Electric Vehicle Sound Alert Speaker Bracket. Low note. Pedestrian SPEAKER. Support cylinder.