This product works very well for my needs. It is very easy to remove and replace the ball on the stem. Seems to be strong towing a 3000# trailer. I bought the box to store them in. I also bought the plastic stem cover but I think it's unnecessary expense since I don't take a ball off and drive around due to the type hitch I have when I am not towing. I take off the whole ball mount and leave the hitch in the receiver.