Rattle activated 120dB anti-theft alarm combines remarkable power and intense loudness to effectively deter theft. Features: Stainless steel lock body provides robust security and rust resistance for long-lasting protection. Offers an impenetrable defense against sawing, prying, smashing, levering, and other forceful attempts. Designed for 5th wheel king pin, covers trailer's 2" king pin to prevent unauthorized hitching, Anti-theft for RVs, Container trailers and campers.