They're pretty strong. And it's handy to have two separate holes on the bottom to choose from for a screw or nail so you can adjust the fit. These 1" clamps will not fit 10 gauge extension cord (the thickest) snugly despite using a narrow screw hole. That was fine with me as I needed a bit of line play, but not too much because I was cornering every few yards. Those curves in the corners kept the cable fairly taut across the line, but I still had that minimal slack to make small adjustments and give the cable a little forbearance where it kinked.
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