Cables for rear surrounds

+1 reubent -- and to amplify his recommendation, BFA-style banana plugs are different from the banana plugs you usually think of. They have considerably better contact area and the tension of them is easy to adjust so that you get a close fit.
Even inexpensive ones like these should work well in your application.
https://www.amazon.com/KnuKonceptz-eKs-Style-Banana-Plugs/dp/B008D2TC4M/ref=sr_1_fkmr0_3?ie=UTF8&...

Agree completely with reubent's comment about BFA connectors. I've put together quite a few speaker cable pairs for myself and others and the various brands of BFA connectors I've used have been the easiest to work with, the easiest to use and the most reliable.