With the Dynavox banana plugs with expansion fixation, bad connections of speaker cables are a thing of the past. The spreading mandrel, which is turned into the plug from the back and expands the plug for a firm hold, guarantees a lasting and firm connection. There can be cables up to a diameter of approx. 4. 5 mm, which are fixed with 2 grub screws. Set of 4 with colour marking red/black in blister packaging.