I asked Product Support is the cable clamp comprised to be one or two screws and I got: "the image is correct, as it and the specifications are normally put on the website by the supplier. The image shows two screws for clamping the cable"
In conclusion there is only one clamping screw and the photo is woefully wrong."
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Review 4 for Earth Clamp EC15 External A-D 12-32mm Pack of 20
"Zoom in on the picture of this product and it shows 2 screw clamp for the cable - which is what I wanted cos its so easy to clamp a thick wire between 2 screws. But when I opened the box the cable clamp has only one screw which is really hard to clamp thick earth cable in as it tends to get squeezed out of the side - I shall be returning them!"