I haven't used them yet but I just plugged them into the machine and terminal. They seem to have a solid connection. The bag seems too weak, taking it in and out frequently may cause the bag to break. These are big and heavy. I chose the big one so I can use it on the biggest car we have in the family. We are listing our oldest cars. I also bought another brand and they are similar to the other set in quality. The labeling and instructions are better on this set. You can't go wrong with any set. I would go by the price.
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