1.HEAVY DUTY TRAILER HITCH PIN LOCK – It’s a newly upgraded trailer hitch receiver lock with all metal construction. Two tubular keys are included to ensure easy fit and detach. 2.UNIVERSAL COMPATIBILITY - The trailer hitch lock is designed with a diameter 5/8" and a length of 3-1/2”. It is compatible with class III IV hitches, 2” 2-1/2” hitch receiver, big towing truck and car (Please make sure of the size of the lock or email us for more information before placing an order).3.SAFE & EASY TO USE - The core of the lock is made of premium zinc alloy tubular. Its anti-theft design can withstand significant blows from different kinds of external force. Additionally, the lock includes a rubber cap and 8 rubber O-rings, which effectively keeps the keyhole away from dirt, dust, water and prevents any rattling noises.The hitch receiver lock pin with premium zinc alloy tubular lock core in newest anti-theft technology to offer the first grade safety for you, and the dust cap aims to keep the keyhole away from water and dirt, great design for easier using.4.PRODUCT OF REMARKABLE WORKMANSHIP - The hitch lock features high quality solid steel with black electrophoretic paint. It is quite sturdy and can carry up to 30,000 lbs, twice as much as that of common pin locks. It is durable, and reliable. 5.WARRANTY SERVICE – We warrant the quality of our products. If you are not satisfied with our lock within 30 days of your purchase, you will get all your money back or a replacement. In addition, a year of quality warranty is provided. auto hitch receiver pin lock trailer receiver lock with 5/8 hitch receiver pin lock trailer locking pin lock black trailer hitch lock 5/8-inch pin diameter heavy duty hitch receiver lock 5/8 metal pin lock for trailer hitch 5/8 hitch receiver lock