Please see my review of the ETI Link Spade, which I find an excellent Product. Here it would be same, but opposite to the Spade version (where you have the same large opening with same, about 1cm long, diameter tube, with 2 screws to hold the wire), the tube, here you enter with the wire and it looses hal of the diameter (the tube) after the first screw. To hold a wire with one screw, just after the opening, makes it for me useless. A shame for that in theory great product.