What is this speaker cable connection?

I could not use with my Arcam solo neo. It never stays there. I tried with KEF LS 50 and It did not work well. The always come off. That's the reason I have asked. 

Clip ‘m ‘n strip ‘m!  Then put on some simple decent bananas. get ones with at least 2 screws. Buy Parts Express # 091-3600 or 091-3610. Both good. BFAs are better than regular bananas. Got to be careful not to exert a shear force though, they can break off. 

If those barrels unscrew and reveal set screws holding the wire down I'd remove those ends and put these on instead.  I've used these on several custome built cables that are budget friendly.  These have a friendly angle for amp side as well as speaker terminals.  The downward angle is convenient on several speakers I have, do not put a high shear force on connections, locking and stackable and they're completely protected against accidental twist contact that could cause a short.

https://www.parts-express.com/angled-locking-stacking-banana-plug-with-dual-set-screws-poly-shell-an...

The downside of those Parts-Express WBT/ Furutech knock-offs is they’re made of brass, not pure copper or a high copper alloy like tellerium or beryllium copper. So they don’t conduct as well as better bananas.