These cables are just right for my dual screen set-up. I'm using them with a Xeon Mac Pro desktop and 2 LG E2442 monitors.
Tested them [cables, monitors & Mac] recently and they work very well together. The resolution of 1920 X 1080 was easily handled.
The cables are solidly constructed for the money and easy to attach and screw-in to the DVI ports on both the monitors and the Mac. This can be done easily by hand or, as the heads have a notch, a flathead screwdriver or coin [at a pinch].
The length is just right with the monitors and Mac on the same surface with a bit of slack on the cables, in my case an old fashioned desk with slide out keyboard and mouse shelf.
But they could easily accommodate the tower being on the ground/floor. For me, this would mean having to stoop to connect peripheral devices such as USB drives or Fire enabled devices. Thus - all on the desk top.
The seller, Computer Products Online, dispatched these rapidly enough and they arrived in decent packaging.
Overall I'm very happy with these cables and would recommend this product and seller. 5 *****