Connor Trailer Hitch Lock - 5/8" Black Nickel Hitch Pin for Class III, IV, V Hitches, 1615190 Receiver Lock SAVE TIME, AVOID FUMBLING WITH KEYS, BE SAFE  Remove the key right after unlocking to avoid all the key fumbling and hassle! Push-to-lock technology ensures a secure fit everytime - PLEASE PUSH ALL THE WAY IN TO HEAR CLICK AND ENSURE IT'S FULLY LOCKED FITS MOST COMMON HITCH SETUPS  Fits ALL Class III/IV 2" x 2" & Class V 2-1/2" x 2-1/2" receivers (5/8" pin) - Contact us on our website if you need more than 2 locks keyed alike EASE OF MIND  Tow up to 20,000 GTW without any worries! 3-1/2" usable length - Please note O-ring cannot be larger and not intended to touch the lock head or it would interfere with the locking mechanism DEPENDABLE STRENGTH  Patented design engineered to increase durability and strength- Includes 2 keys and an all-weather rubber key slot cap CONSTRUCTED FROM HEAVY DUTY SOLID STEEL FOR SUPERIOR STRENGTH  Durable Black Nickel Finish - For replacement keys or rubber cap please visit our website or contact us on Amazon