[Package Contents]: RV fifth wheel hitch lock set includes a 3-inch (7.6 cm) tall king pin hitch lock with slide bolt pin, 2 keys, and a plastic warning tag; Ideal for truck companies, RV dealers, and fleet drivers [Heavy-Duty Steel Construction]: Solid steel cuff has a 2.8-inch (7.1 cm) inner diameter and a 3.4-inch (8.6 cm) outer diameter for durability and strength; High gloss finish resists rust and corrosion caused by elements [Easy to Use]: Slide cuff onto hitch and engage the fifth wheel kingpin lock using the included keys; Lock cylinder slides inwards to ensure a sturdy, tamper-resistant connection that protects your trailer from being towed away [Fluorescent Tag]: Extra visual warning helps prevent accidents that could damage your vehicle while your RV king pin lock is engaged; 12-inch (30.5 cm) steel chain ensures your tag will stay connected to your 5th wheel trailer hitch lock The BISupply 5th Wheel RV Hitch Lock attaches to your trailer hitch and locks into place on your fifth wheeler, boat, camper, and utility trailers. Stainless steel fifth wheel pin lock is 1/4-inch (0.6 cm) thick for maximum strength and durability, while sliding lock pin moves only when lock key is engaged for a tamper-resistant connection that protects your property. Fluorescent warning tag reminds you that the RV 5th wheel pin lock is engaged to prevent accidental attempts to hook ups that waste your time and could cause damage. Caution information is written in English and French and attached to the fifth wheel trailer hitch lock with a 12-inch (30.5 cm) chain for added security. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.