First time buying anything like this so please excuse my naivety and their for nothing to compare it with but everything works well.
They obviously can hold banana clips inside either end but also unscrew so that you could put them inside the hole sideways on both ends, much like the speaker and av banana ports I've seen. This allows you to not even need banana plugs in a pinch as speaker wire could firmly secure to both sides with the threaded part. This is especially useful if you don't want to use a banana plug on the side in wall and probably the normal usage to be expected and I'm just a noob. I bought banana plugs for both sides so I'm using them