Folks need to understand that this is not a security device. It may keep a child from unhooking your coupler, but that is about it. That is not why I marked it down. I marked it down because the advertisement reads "This is made of solid brass." NO, IT IS NOT. Brass does not rust and this device does. This is the second item, in this order alone, that included false statements in its description. From now on, if the description does not say "made in USA" I am buying from a different web site.