Excellent quality product, the shaft has 2 screws at opposing sides of the barrel. This means the cable is secured in an S-shape, meaning excellent connection and it's held in TIGHT. It aint moving anywhere.
The rubber covers are nice and slide on and off with a good amount of friction, so also not moving.
The banana clip itself seemed too large for my 3-4mm size openings on speakers and amp, but it squashes down easily enough to fit. And then holds in place nicely with some spring left. It will compress a little but there's enough tension to maintain a good connection.
The only negative is that this is packaging hell. Each pair is separately bagged in plastic. Then the lot is plastic bagged. Obviously then in a box from amazon with packaging.