Instruct: Classify Amazon reviews into positive or negative sentiment
Query: lock

It works as expected. I use the thicker shaft in the hope it helps with rattle. My cargo shelf still moves around, but nothing major and not too noisy. It is a pain to duck under the shelf to lock and unlock the unit: a side mounted lock would be easier. For the money, I recommend it. I have not used it for long distances where it is exposed to the weather, so I can't comment on the "rustproof-ness" of it.Update: Used for two summers now in highly dusty/rainy/salty environments. Still looking good! The cover definitely helps keep the lock portion clean and smooth. Unlike S. Rosenbloom, I don't keep it on full time, but only when I'm using an appliance on my hitch--so there is the difference. For my on-and-off usage, I am pleased.