Grand General 81462 Steel Trailer King Pin Lock with Caution Tag Safeguard the king pin of semi-trailers, RVs and other fifth wheel trailers to help prevent theft Lock covers the entire king pin, prohibiting fifth wheel from connecting to king pin 3-3/8" diameter x 3" high with 1/4" thickness steel wall Help protect your trailer and investment Caution tag and 2 keys are included; sold as each