Swivel Head Receiver Lock, Features: Fits Both 1/2" and 5/8" Receivers, Usable Length of Receiver Pin is 3", Push to Lock(TM) Locking Mechanism- Push Lock Body Onto Pin Firmly and Remove Key, Weather Tough(R) Seal and Water Tight Cap Protects Lock From Moisture and Dirt, 4-Pin Tumbler Mechanism Resists Picking, K1 Key Blank, For Use With: 1/2" Pin is Rated for Class I/II; 3,500 lb. Load Rating, 5/8" Pin is Rated for Class III/IV; 10,000 lb. Load Rating, Popular Branded Trailer Receivers, Automotive And Towing, Trailers, Vans And Moving Trucks, Marine Recreation