Review on CZC AUTO Heavy Duty Trailer Hitch Receiver Lock Pin, 5/8 Inch Dia, Ultra Long 4 Inch Black Pin for Class III IV Hitches, Ideal for Hitch Bike Rack Tray Ball Tow Rope, Compatible with Trailer Truck Car Boat by Mike Davis

Difficult to turn the lock from the start. The first time was more than a month after purchase, so it's too late to return it. It only got worse. I filled it with wd40 and kept the cap on. If I have to remove it, I can't count on it working. I will try another brand. By the way, it's actually a trademark of Metoware. (You can see it in the picture of the key in the ad.