Excellent quality and design. Two grub screws give a very firm connection. I stripped enough insulation so the 2nd screw gripped the insulation (I screwed this in first to make the cable secure before screwing in the 1st grub screw) and 1st screws gripped the copper conductor so the cable was very secure. The plastic sleeve has a threaded brass insert so screws on easily and is much better than cheaper plugs that have the plastic threaded which tends to strip away. Also the sleeve screws on from the plug end not the cable end so can screwed on after cable is fitted, which makes it much easier to fit the plugs. You also don't have to remember to put the sleeve over the cable before fitting the plug. This made fitting the plugs so easy, the plugs make a good firm contact in the amps and speaker connecters and are gold plated and are not bulky so do not get in the way on the back of the amp.