I bought butt connectors from the same company and they seem to fit, but these ring connectors don't crimp securely. I've tried half a dozen times, approaching it from a variety of angles, and nothing has produced a strong bond that can't be easily torn apart. Some people have given very good reviews, but there are also a significant number of bad reviews. They must have a poor quality control process that allows for bad batches. ***UPDATE*** I'm changing my rating from one star to four. I bought one of Qibaok's crimping tools and now I'm getting a good, reliable crimp. The cheap pliers I've used for years just don't work with these connectors. Subtract a run as the heat shrink tubing leaves some wire at the end to the connector so these connections are not waterproof. Overall not bad for the price.
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